Tennis: Mass security for Nadal's Mexico event

ACAPULCO, Mexico: A brutal gang rape and other crimes have prompted a massive security operation for Acapulco's tennis tournament, with 4,000 personnel to be deployed at an event headlined by Rafael Nadal.

The Pacific port has become Mexico's deadliest city and local police have struggled to stem a brutal turf war between drug gangs where the intimidation of rivals includes the dumping of headless bodies in the streets.

The unprecedented show of security at the tennis event is three times the size of Acapulco's own police force and will feature army, navy, federal, state and municipal police, a senior Guerrero state government official told AFP.

Members of the deployment will begin to arrive on Wednesday, said the official, who spoke on condition of anonymity regarding next week's tournament.

Tourists had been relatively shielded from the city's violence until a group of gunmen stormed a beach bungalow on February 3 and raped six Spanish women after tying up seven Spanish men and a local woman.

The scaled up force will secure access to the Mextenis stadium, which has a capacity of 7,500, and the Hotel Fairmont Acapulco Princess, with a security perimeter being installed and cars will also be checked.

Former world number one Nadal, who won the Brazil Open on Sunday after a seven-month hiatus due to a knee injury, will be the top ranked player at Acapulco's red clay tournament which begins February 25 and ends March 2.

- AFP/al

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Pistorius' girlfriend was alive after shooting, official says

STORY HIGHLIGHTS

• NEW: Detectives are examining role of a blood-stained cricket bat, newspaper reports


• Runner Oscar Pistorius has been charged with murder in model Reeva Steenkamp's death


• Steenkamp was still alive when Pistorius carried her downstairs, an official says

Pretoria, South Africa (CNN) -- Model Reeva Steenkamp was shot four times through the bathroom door at the home of Olympian Oscar Pistorius, a South African official familiar with the case told CNN on Monday.

She was alive after she was shot and was carried downstairs by Pistorius, said the official, who was not authorized to release details to the media.

A blood-stained cricket bat has also emerged as key evidence in the case, according to the City Press newspaper of Johannesburg.

Detectives are working to determine whether the bat was used to attack Steenkamp or she used it in self-defense, the newspaper reported, citing a source with inside knowledge of the case. Detectives are also looking into the possibility that Pistorius used the bat to break down the bathroom door.

The details are the latest to emerge in the shooting death that has roiled the nation and left South Africans asking what went so terribly wrong inside the upscale Pretoria home of the man nicknamed "Blade Runner" for his lightning-fast prosthetic legs.

The official, who spoke on condition of anonymity, said there were indications the 29-year-old model intended to stay the night at the house: She had an overnight bag and her iPad.

Opinion: Pistorius case and the plague of violence against women

Authorities have released little about a possible motive in the Valentine's Day shooting, while local media have reported that Pistorius had mistaken his girlfriend for an intruder. South African authorities have stressed that the scenario did not come from them, and said there was no evidence of forced entry at the home.

Police have charged Pistorius with murder, and he will appear in court Tuesday for a bail hearing. South African prosecutors have said they intend to upgrade the charge to premeditated murder, but have not released further details.

Pistorius, 26, has rejected the murder allegation "in the strongest terms," his agent said in a statement.

Nike's bullet ad with Pistorius backfires

Burial service

The same day Pistorius returns to court, Steenkamp will be buried in a private service in her hometown of Port Elizabeth.

Her burial Tuesday will come two days after South Africa's national broadcaster aired a pre-recorded reality TV show featuring Steenkamp discussing her exit from "Tropika Island of Treasure," on which local celebrities compete for prize money.

The decision to air the program took "much deliberation," and "this week's episode will be dedicated to Reeva's memory," said Samantha Moon, the executive producer.

The shooting has stunned South Africa, where Pistorius is a national hero as the first disabled athlete to compete in the able-bodied Olympic Games. He competed in the London Games as well as winning two gold medals in the Paralympic Games.

Headlines about the case have dominated in the days since Pistorius was arrested, though tight-lipped authorities have revealed little about what, if anything, the track star has said.

Oscar Pistorius with Reeva Steenkamp in January 2013.

Questions swirl

Reports say Pistorius and Steenkamp became an item around November and were popular in South African social circles.

The night before the shooting, Steenkamp appeared to be looking forward to Valentine's Day.

"What do you have up your sleeve for your love tomorrow?" she asked her Twitter followers the day before. "Get excited."

Steenkamp was found in a pool of blood at Pistorius' home Thursday morning. Neighbors alerted authorities to the early morning shooting, saying they had "heard things earlier," police spokeswoman Denise Beukes has said. She did not clarify what the neighbors reported they heard.

Authorities also have not said whether Pistorius called for help.

Pictures of his walk to a police car, his head covered by a sweatshirt, have flashed repeatedly across television screens.

On Sunday, Pistorius canceled his appearances in five upcoming races.

The move is meant to help Pistorius focus on the legal proceedings and "help and support all those involved as they try to come to terms with this very difficult and distressing situation," said Peet Van Zyl of Pistorius' management company, In Site Athlete Management.

CNN's Robyn Curnow reported from South Africa; Chelsea J. Carter and Faith Karimi reported from Atlanta.

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WH: Leaked immigration plan is only partial draft

(CBS News) WASHINGTON -- Over the weekend, a partial White House plan for immigration reform leaked to the press and caused an uproar.

White House officials tell CBS News that what was leaked is real -- it's a partial draft of half a bill. What we know is the administration's current thinking about what to do about the estimated 11 million illegal immigrants living in the United States right now.

The administration wants a temporary four-year visa to provide legal status -- meaning no more deportations -- that could be renewed. After eight years, they can apply for what's known as permanent legal residency, or, more commonly, a Green Card.

(At left, watch White House Chief of Staff Denis McDonough discuss the leaked immigration plan on "Face the Nation.")

There's also administration thinking on border security and an unspecified increase in border security, subject to negotiations with Congress. For workers who try to find jobs in the future and who might not have documents, the plan includes an E-Verify system to make sure undocumented workers aren't given jobs.

GOP: Leaked WH immigration plan "counterproductive"
W.H. immigration plan circulating in case Congress talks "break down," McDonough says

What's missing is a section dealing with all future legal immigration issues: high-skilled workers, seasonal farm workers and workers who work in hotels or restaurants. Without that, this plan doesn't have much of a chance.

The plan is not likely to get through Congress without the section dealing with legal immigration. That's why Republicans were so critical this weekend.

Last year, Republicans criticized the president for being missing in action and failing to draft a bill. Now that he admits he is, Republicans say he's contaminating that process; they argue that if you don't have a comprehensive bill -- one that can pass Republicans and Democrats in both the House and Senate -- this is a futile effort.

The White House says Republicans are going to be dared to vote up or down eventually, and that they better get used to that.

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Nike, Oakley Distance Themselves from Pistorius

Corporate sponsors of Olympic "blade runner" Oscar Pistorius have begun to distance themselves from the sprinter, who is accused of murdering his model girlfriend, Reeva Steenkamp. Pistorius is back to court in South Africa Tuesday morning on murder charges.

Oakley, the eyewear manufacturer, and the sporting goods giant Nike announced today that they would no longer run ads featuring Pistorius, the South African double-amputee who gained worldwide fame for running on carbon-fiber blades.

"In light of the recent allegations, Oakley is suspending its contract with Oscar Pistorius, effective immediately. Our hearts are with the families during this difficult time and we'll continue to follow the developments in this tragic case," Oakley spokeswoman Cheri Quigley said in a statement released this afternoon.

Earlier in the day, Nike said it had "no plans" to use Pistorius in future ad campaigns, according to the Associated Press. Nike had already pulled an Internet ad showing Pistorius starting to sprint with the caption, "I am the bullet in the chamber."

The companies made their announcements shortly after Pistorius' own agent, Peet Van Zyl, said publicly that he expected the sponsors to stick with Pistorius through the legal process.

PHOTOS: Paralympic Champion Charged in Killing

Pistorius will appear in court Tuesday morning for a bail hearing. His attorneys are expected to argue against the charge of premeditated murder.

His family has said the shooting was an accident.

The news comes as more details emerge about the incident on Thursday morning in which Pistorius allegedly shot and killed Steenkamp at his gated home in Pretoria, South Africa.

Bryn Lennon; Gallo Images/Getty Images

Oscar Pistorius Allegedly Fought the Night of Shooting Watch Video

Oscar Pistorius: Possibly Incriminating Information Leaked Watch Video

'Blade Runner' Murder Charges: Family Insist Accidental Shooting Watch Video

News reports in local papers have said that police are investigating whether Pistorius had an anger-management problem that led to the incident. They focused in on a bloodied cricket bat that may have been used when Steenkamp died.

A "shocked" teammate of Oscar Pistorius rebutted the rumors and speculation in South Africa that Pistorius had an anger problem.

Ofentse Mogawane, a sprinter for the South African Olympic team who ran the 400-meter relay with Pistorius in the London summer games last year, said Pistorius had always been genial to him and other people.

Mogawane said he would be in court Tuesday to support his friend.

"Basically, he was a very good guy to us, to the teammates and to most athletes," Mogawane said. "He was a really humble person and I wouldn't say a bad word about him. We never had any kind of clash, never any kind of fight or disagreement or arguing.

"The way Oscar's case was, it shocked me, shocked most of the people who know him. Tomorrow in court I am going to be there to support him. To hear what happened the night of the incident," he said.

"Sometimes when people are angry they cannot control their anger. Something must have happened."

Mogawane, 30, spoke in support of Pistorius after a report in South Africa's City Press newspaper that claimed police were looking into the possibility that a bloody cricket bat found in his bedroom was used before the shooting.

"The way the news has been running around in South Africa, that he is a short-tempered person, a person who has problems with anger management, they just want something to say," Mogawane said. "They don't know Oscar at all. They just want to get interviewed and take pictures. But truly speaking, it's just a lot of speculation."

Mogawane said he had seen Pistorius become angry before, but only in the same way as any other athlete or person.

But the City Press reported Sunday that police are investigating different scenarios involving the bat. Among them is the possibility that the flat-fronted bat was used in a violent argument before the shooting.

The paper also reported that Pistorius might have first shot Steenkamp in the bedroom, and that she possibly fled to the bathroom where she was shot three more times through the door.

When Pistorius' family arrived at the scene before paramedics, they saw him carrying Steenkamp down the stairs and performing mouth-to-mouth resuscitation on her, City Press reported.

Pistorius, who is nicknamed the "blade runner" because of the carbon-fiber blades on which he runs, has canceled all his upcoming racing appearances, his agent said Sunday night.

The decision was made to "allow Oscar to concentrate on the upcoming legal proceedings and to help and support all those involved as they try to come to terms with this very difficult and distressing situation," Van Zyl, of In Site Athlete Management, said in a statement.

Pistorius' father was quoted overnight in the South African paper The Sunday Times saying his countrymen are destroying a national icon.

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Wiping out top predators messes up the climate

Wiping out top predators like lions, wolves and sharks is tragic, bad for ecosystems – and can make climate change worse. Mass extinctions of the big beasts of the jungles, grasslands and oceans could already be adding to greenhouse gases in the atmosphere.

Trisha Atwood of the University of British Columbia in Vancouver, Canada, studied the effect of removing predator fish from ponds and rivers in Canada and Costa Rica. Across a range of ecosystems, climates and predators, she found a consistent pattern: carbon dioxide emissions typically increased more than tenfold after the predators were removed.

"It looks like predators in many types of ecosystems – marine and terrestrial as well as freshwater – can play a very big role in global climate change," she told New Scientist.

The widespread and dramatic ecological impacts of the loss of top predators are well known. In the ensuing "trophic cascade", the vanished top predator's prey proliferate, which in turn puts pressure on the species that the prey eats, and so on down the food chain. In this way, changes at the top of a food chain destabilise the balance of populations right the way down.

But the geochemical impacts of trophic cascades, including any impact on emissions from ecosystems, are much less well known. Atwood's study of freshwater ecosystems showed how changes to species at the bottom of the food chain, such as photosynthesising algae, following the removal of a top predator dramatically increased the flow of CO₂ from the ecosystem to the atmosphere.

The effect will not always be to increase CO₂ emissions, however – sometimes the loss of top predators could decrease emissions, she says. "But we show that something so seemingly unrelated, like fishing all the trout from a pond or removing sharks from the ocean, could have big consequences for greenhouse-gas dynamics."

Help from kelp

Other recent studies have hinted at similar effects. Last October, Christopher Wilmers of the University of California, Santa Cruz, reported how the disappearance of sea otters is linked with increased CO₂ emissions from North American coastlines (Frontiers in Ecology and the Environment, doi.org/khz). With no otters eating them, sea urchins thrive and eat out kelp forests – often known as the "rainforests of the oceans" – resulting in major CO₂ releases.

Global climate models do not take such impacts into account yet. Atwood says they could be major, as freshwater emissions may be on a par with the influence of deforestation, which is thought responsible for around 15 per cent of human-caused CO₂ emissions.

Environmentalists will herald the findings as further evidence that it is vital to protect pristine habitats and the charismatic species at the top of their food chains. But there is a dark side. A recent study found that some island ecosystems around New Zealand store 40 per cent more carbon than others because of their top predators – invading rats that are wiping out seabird colonies. Rats, it seems, are good for the climate (Biology Letters, doi.org/bbmtw9).

Journal reference: Nature Geoscience, DOI: 10.1038/NGEO1734

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Could 9-year-old win youngest best actress Oscar?

LOS ANGELES: She landed the part by lying about her age: Quvenzhane Wallis was five, and the filmmakers were only auditioning girls at least six years old.

But they believed her fib and tried her out -- and were blown away, giving her the starring role in the low-budget "Beasts of the Southern Wild" over 4,000 other hopefuls.

And now she could become the youngest ever winner of the best actress Oscar, at the 85th Academy Awards, the climax of Hollywood's annual awards season, next weekend.

"It was very clear ...you don't meet six-year-olds who have that quality," said director Benh Zeitlin, recalling her audition. "She just had this natural charisma and focus and fierceness and wiseness and morality.

"Coming out of a body that small and a mind that young, it's almost alien and alien in a way that goes kind of straight at your heart .. It's her perspective that unlocks the truth in the film."

That charisma is obvious when you see Wallis being interviewed to promote the movie over recent months, even before it was elevated to the stratosphere by being nominated for four Oscars in January, including best picture.

"I was in my bedroom half asleep," Wallis told Jay Leno, about waking last month to learn she was nominated alongside Jessica Chastain, Jennifer Lawrence, Naomi Watts and Emmanuelle Riva, the oldest ever best actress nominee, at 85.

"So nothing reacted on the outside, but I was like flipping cartwheels and stuff on the inside," she told the talk show host, whom she admonished -- cutely -- for asking her a question more appropriate for the director.

In the movie Wallis plays Hushpuppy, living in the Louisiana bayou with her hot-tempered and ailing father Wink, in a community threatened by floods driven by melting ice-caps.

"Beasts of the Southern Wild" won the prestigious Camera d'Or at last year's Cannes Film Festival in France, and the Grand Jury Prize for a dramatic film at Sundance.

The movie's setting was close to Wallis' home: the actress -- her first name is pronounced Qua-ven-zhah-nay -- was born in Houma, Louisiana, on August 28, 2003. The "zhane" part of her name means fairy in Swahili.

"Beasts" was her first acting job, and she only got it after ignoring the filmmaker's audition rules -- perhaps, appropriately, like the character she was asked to play.

"It was for a six-to-nine-year-old. So my Mom said I couldn't go 'cause I was only five. But we just went and we act like we're having nothin' to do; we had done nothin' wrong," she said.

"The character who is Hushpuppy, she does what is right and she is fearless and that's what I did at the audition."

Wallis is the youngest best actress Oscar nominee by four years: the next is Keisha Castle-Hughes, who was 13 when nominated for "Whale Rider" in 2003. The third, Lawrence, nominated again this year, was first tapped in 2010 at age 20 for "Winter's Bone".

The youngest ever best actress Oscar winner is Marlee Matlin, who took the prize in 1986 for "Children of a Lesser God" at the positively mature age of 21 years and 218 days.

The youngest person to ever win an Oscar in any competitive category is Tatum O'Neal, who was just 10 when she took home the best supporting actress prize in 1973.

Wallis is already on her third film -- "Twelve Years a Slave," with Brad Pitt, Benedict Cumberbatch and Michael Fassbender, due out in September. She has also made "Boneshaker," a short about an African family lost in America.

Whether she wins an Oscar on Sunday or not -- the favorites are Chastain and Lawrence, admittedly -- she is clearly a force to be reckoned with, and an actress to watch out for in years to come.

-AFP/gn

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Pope delivers one of his final messages

By Hada Messia and Josh Levs, CNN

updated 7:21 PM EST, Sun February 17, 2013

Pope Benedict XVI waves as he arrives to lead the Angelus prayer at the Vatican on Sunday.

STORY HIGHLIGHTS

• It's the pope's second-to-last Angelus prayer as pontiff


• Pope Benedict XVI thanks his flock for prayers and support


• He discusses "decisive moments of our lives"


• Cardinals may meet before March 15

(CNN) -- Pope Benedict XVI led tens of thousands in a prayer for strength Sunday and thanked followers for their support during his second-to-last Angelus prayer as pontiff.

"Today we contemplate Christ in the desert, fasting, praying, and being tempted," the pope said to an unusually large crowd at St. Peter's Square in Vatican City.

"As we begin our Lenten journey, we join him and we ask him to give us strength to fight our weaknesses. Let me also thank you for the prayers and support you have shown me in these days. May God bless all of you!"

Benedict, 85, shocked millions across the world last week when he announced his intention to stand down at the end of the month, citing the frailty of old age.

The decision makes him the first pope to step down in nearly 600 years.

Referring Sunday to a Bible passage, the pope said, "During the decisive moments of our lives, and in fact at every moment, we are in front of a crossroads: Do we want to follow the I or God? The individual interest or the true good, that which really is the good?"

The crowd appeared to have about 100,000 people

He also tweeted a message to followers worldwide, calling on them to "rediscover faith" as a foundation.

Cardinals may meet before March 15 to choose the next pope if they are all in Rome, a Vatican spokesman said Saturday. The conclave will bring together the 117 cardinals of the Roman Catholic Church.

Part of complete coverage on

What do you think about the Pope's decision to resign? If you are a Catholic, how will it affect you? Send us your thoughts and recollections.

Read all of the latest updates, including standards for the next pope and possible successors on CNN's Belief Blog.

They are the largest group in the Roman Catholic Church, and the next pope might even come from their midst. Yet few have heard how Latino Catholics regard the legacy of Pope Benedict XVI.

updated 11:07 AM EST, Tue February 12, 2013

Before he was Pope Benedict XVI, before he earned the nickname "Cardinal No" as the enforcer of church doctrine, he was Joseph Ratzinger.

The news stunned both the Church's 1.2 billion followers and the rest of the world. Here's a collection of your views from social media.

updated 11:02 AM EST, Tue February 12, 2013

Pope Benedict XVI's decision to resign caught a lot of Vatican watchers, apparently even some in his inner circle, off-guard. They should not have been so surprised.

updated 9:36 AM EST, Mon February 11, 2013

Pope Benedict's German background has always been a talking point. CNN's Fred Pletigen takes a look at Pope's German roots.

updated 7:27 PM EST, Mon February 11, 2013

Pope Benedict XVI on Monday said he plans on resigning the papal office on February 28. Click here for the full text of Benedict's declaration.

updated 12:30 PM EST, Mon February 11, 2013

Assuming Pope Benedict XVI steps down as planned at the end of February, his tenure on Twitter will have been fleeting.

updated 6:26 AM EST, Tue February 12, 2013

After his resignation, Benedict, 85, will probably retire to a monastery and devote himself to a life of prayer. Look back at his time as Pope.

updated 2:12 PM EST, Mon February 11, 2013

The surprising news from Rome, Monday, leaves the church and the world in unfamiliar, but not entirely uncharted, territory.

updated 9:13 AM EST, Mon February 11, 2013

Pope Benedict directed the church's response to decades of abuse by its priests. CNN's Nic Robertson reports.

updated 11:06 AM EST, Tue February 12, 2013

We explore what the surprise announcement means for the Catholic Church.

updated 8:58 AM EST, Mon February 11, 2013

CNN's Jim Bittermann looks at the legacy and controversies that have marked Pope Benedict XVI's reign.

updated 10:56 AM EST, Fri November 23, 2012

A book released by Pope Benedict XVI last year looks at the early life of Jesus -- and debunks several myths about how the Nativity unfolded.

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In Libya, justice elusive on uprising's anniversary

BENGHAZI, Libya Col. Faraj el-Dersi, who defected to the rebel side from Muammar Qaddafi's police force, was gunned down late last year on the streets of Benghazi, and he bled to death in the arms of his teenage daughter.

24 Photos

Elections in Libya

35 Photos

The life of Muammar Qaddafi

As Libya on Sunday marked the second anniversary of the start of the uprising that toppled Qaddafi, the death of el-Dersi and nearly 40 other similar slayings are seen as evidence that some in the country are too impatient for a political system that has yet to deliver justice and national reconciliation.

Suspicion in many of the killings of senior security and military officials has fallen on Islamists who were brutally suppressed under Qaddafi. Now, they have become among the most powerful groups in the new Libya, particularly in the east, with heavily armed militias at their command.

And they are settling old scores themselves, rather than wait for transitional justice — the process of society punishing or forgiving the abuses of the old regime.

Mustafa al-Kufi, a 59-year-old former prisoner and political activist, said the various post-Qaddafi governments and the current parliament are all fearful that if they head down the path of transitional justice, many members of the ruling class would be among those punished for past wrongdoing.

"This is a very pressing issue and a core demand in the street," said al-Kufi, who spent 12 years in prison under Qaddafi.

"We need to know who did what and then ask families of the victims for forgiveness. But since this didn't take place, violence will continue because there is no justice.

Like other Arab countries that ousted authoritarian leaders, Libya is now mired in a chaotic and violent transition to a new society. It is plagued by unruly and heavily armed militias that have slowly come under a unified command but remain filled with hard-liners who were in the front line in the war against Qaddafi.

The transition is further complicated by an autonomy movement in the oil-rich east, a central government too weak to exert its authority across the vast desert nation, and heavily armed Islamic extremists who are pressing to fill a power vacuum.

The civil war swept Qaddafi from power, but the bitterness and rage lingers in a country where the authoritarian government imprisoned, tortured and killed its opponents.

Hana al-Gallal, a prominent Benghazi lawyer, said allowing old regime figures to be part of the new order will only fuel more violence.

"Those whose sons were killed, their dreams shattered by the Qaddafi regime, will seek revenge when they see them back in power," she said. "The result is assassinations."

Some of the anger is directed at those who were in the old government — from low-level police officials to ex-ministers who are now police chiefs and lawmakers. That has prompted a push to prevent those with ties to the former leadership from serving in positions of power.

Libya's parliament, the General National Congress, is debating a draft bill that would bar anyone deemed to have had ties to the former regime from state institutions for 10 years. A version of the draft law published on the GNC's website last week listed 36 reasons for excluding Libyans from political life.

They include those who participated in Qaddafi's coup in 1969; members of the notorious Revolutionary Guards, which were formed to hunt down the dictator's opponents; those who took part in reform efforts in the 2000s led by Qaddafi's son, Seif al-Islam; and those who worked for leading magazines, newspapers, news agencies or served as an ambassador under Qaddafi.

The bill's supporters say such sweeping measures are needed to allow the ministries and state institutions in the fledgling democracy to develop free of the toxic influence and corruption of the Qaddafi era and to stop the cycles of bloodshed like what happened in Benghazi.

1/2

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Pistorius Case: Agent Cancels All Future Races

Oscar Pistorius won't run in any of the future races that the athlete was contracted to compete in, but the Paraylmpic gold medalist's sponsors are still supportive as he faces a murder charge, his agent said today.

The decision to cancel Pistorius' scheduled appearances was made to "allow Oscar to concentrate on the upcoming legal proceedings and to help and support all those involved as they try to come to terms with this very difficult and distressing situation," Peet Van Zyl of In Site Athlete Management said in a statement.

"I have decided that following these tragic events that we have no option but to cancel all future races that Oscar Pistorius had been contracted to compete in," Van Zyl said.

Pistorius was slated to compete in races in Australia and Brazil, as well as at the Drake Relays in Iowa and the Manchester City Games in the U.K.

Van Zyl also said that Pistorius' sponsors and partners are supportive.

"I can confirm that at this point in time, all parties are supportive and their contractual commitments are maintained. They have said they are happy to let the legal process takes its course before making any change in their position," Van Zyl said in the statement.

However, M-Net movies, a subscription-funded South African television channel has pulled their ad campaign featuring Pistorius, tweeting, "Out of respect & sympathy to the bereaved, M-Net will be pulling its entire Oscar campaign featuring Oscar Pistorius with immediate effect."

The agent's announcement comes as family and friends rallied to Pistorius' defense -- saying they believe the Paralympic gold medalist's story that he shot his model girlfriend Reeva Steenkamp by accident after he mistook her for an intruder.

Adrian Dennis/AFP/Getty Images; Mike Holmes/The Herald/Gallo Images/Getty Images

'Blade Runner' Murder Mystery: Family Speaks Out Watch Video

'Blade Runner' on Suicide Watch After Charged With Girlfriend's Murder Watch Video

Oscar Pistorius Charged in Shooting Death of Girlfriend Watch Video

"When you are a sportsman, you act even more on instinct ... it's instinct -- things happen and that's what you do," Pistorius' father Henke Pistorius, 59, told The Telegraph.

The 26-year-old athlete, known as the "Blade Runner" because of the carbon-fiber blades he runs on, was charged Friday with premeditated murder.

PHOTOS: Paralympic Champion Charged With Murder

If convicted, Pistorius could face at least 25 years in jail.

"All of us saw at firsthand how close [Steenkamp] had become to Oscar during that time and how happy they were. They had plans together and Oscar was happier in his private life than he had been for a long time," Pistorius' uncle Arnold Pistorius said on Saturday.

According to South African newspaper Beeld, Steenkamp was killed nearly two hours after police were called to Pistorius' home to respond to reports of an argument at the complex.

Police said they have responded to disputes at the sprinter's residence before, but did not say whether Steenkamp was involved.

The athlete's best friend said Pistorius called him after the shooting to say "there has been a terrible accident, I shot Reeva," Justin Divaris told the Sunday People.

While his family insists he is not a murderer, prosecutors disagree.

Police sources told local media that Steenkamp was shot through the bathroom door where she may have been trying to hide to save herself.

Reeva Steenkamp

A memorial service for Steenkamp will be held in Port Elizabeth on Tuesday evening, SABC reported. Her body will be flown back for the service before being cremated, her family said.

"Her future has been cut short ... I dare say she's with the angels," said Mike Steenkamp, Reeva Steenkamp's uncle.

The South African reality show Steenkamp competed in premiered Saturday night on SABC as planned and included a special tribute to the slain law school graduate whose modeling career was starting to take off.

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False memories prime immune system for future attacks

IN A police line-up, a falsely remembered face is a big problem. But for the body's police force – the immune system – false memories could be a crucial weapon.

When a new bacterium or virus invades the body, the immune system mounts an attack by sending in white blood cells called T-cells that are tailored to the molecular structure of that invader. Defeating the infection can take several weeks. However, once victorious, some T-cells stick around, turning into memory cells that remember the invader, reducing the time taken to kill it the next time it turns up.

Conventional thinking has it that memory cells for a particular microbe only form in response to an infection. "The dogma is that you need to be exposed," says Mark Davis of Stanford University in California, but now he and his colleagues have shown that this is not always the case.

The team took 26 samples from the Stanford Blood Center. All 26 people had been screened for diseases and had never been infected with HIV, herpes simplex virus or cytomegalovirus. Despite this, Davis's team found that all the samples contained T-cells tailored to these viruses, and an average of 50 per cent of these cells were memory cells.

The idea that T-cells don't need to be exposed to the pathogen "is paradigm shifting," says Philip Ashton-Rickardt of Imperial College London, who was not involved in the study. "Not only do they have capacity to remember, they seem to have seen a virus when they haven't."

So how are these false memories created? To a T-cell, each virus is "just a collection of peptides", says Davis. And so different microbes could have structures that are similar enough to confuse the T-cells.

To test this idea, the researchers vaccinated two people with an H1N1 strain of influenza and found that this also stimulated the T-cells to react to two bacteria with a similar peptide structure. Exposing the samples from the blood bank to peptide sequences from certain gut and soil bacteria and a species of ocean algae resulted in an immune response to HIV (Immunology, doi.org/kgg).

The finding could explain why vaccinating children against measles seems to improve mortality rates from other diseases. It also raises the possibility of creating a database of cross-reactive microbes to find new vaccination strategies. "We need to start exploring case by case," says Davis.

"You could find innocuous pathogens that are good at vaccinating against nasty ones," says Ashton-Rickardt. The idea of cross-reactivity is as old as immunology, he says. But he is excited about the potential for finding unexpected correlations. "Who could have predicted that HIV was related to an ocean algae?" he says. "No one's going to make that up!"

This article appeared in print under the headline "False memories prime our defences"

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