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Agence France-Presse

British police investigating a deadly attack on parliament made a new arrest Sunday as officials set their sights on accessing WhatsApp, the heavily-encrypted messaging service that was used by the killer.
The arrest came four days after the lightning assault that unfolded in the shadow of the Houses of Parliament, in which an apparently lone attacker killed four people and wounded 50 before being shot dead by armed police.
The latest arrest was a 30-year-old man who was detained in the central city of Birmingham on suspicion of preparing terrorist acts, London’s Metropolitan Police said.
From Adrian Russell Ajao to Khalid Masood: What we know about London attacker
A dozen people have been arrested since Wednesday’s attack by 52-year-old Khalid Masood who deliberately ran down pedestrians on Westminster Bridge then stabbed a policeman just inside the gates of parliament.


Nine people have been released without charge, while a 58-year-old man remains in custody and a 32-year-old woman has been released on bail.
The arrest came as the government confirmed Masood had used the WhatsApp messaging service, saying it was crucial that the security services be allowed to access the heavily-encrypted app.
Media reports said Masood used the Facebook-owned service just minutes before staging his assault, although it was unclear whether he sent any messages or just looked at the app.
Speaking to Sky News, Home Secretary Amber Rudd said it was “completely unacceptable” that police and security services had not been able to crack the heavily-encrypted service.
“You can’t have a situation where you have terrorists talking to each other - where this terrorist sent a WhatsApp message - and it can’t be accessed,” she said.
Police had on Saturday acknowledged they may never know why Masood, a Muslim convert with a violent criminal past, carried out the attack and that he probably acted alone, despite a claim of responsibility by the Islamic State group.
Although police believe he acted alone on the day, investigators are still trying to find out whether he was encouraged or directed by others.
“There should be no place for terrorists to hide,” Rudd said in a separate interview with the BBC.
“We need to make sure that organisations like WhatsApp - and there are plenty of others like that - don’t provide a secret place for terrorists to communicate with each other.”
WhatsApp said it was “horrified” by the attack and was working with the investigating authorities without saying whether it would change its encryption policy.
“We are horrified at the attack carried out in London earlier this week and are cooperating with law enforcement as they continue their investigations,” a spokeswoman said.
Rudd acknowledged that end-to-end encryption was vital to cyber security, to ensure that business, banking and other transactions were safe - but said it must also be accessible.
“It’s not incompatible. You can have a system whereby they can build it so that we can have access to it when it is absolutely necessary,” she told Sky News.
Rudd said she did not yet intend to force the industry’s hand with new legislation, but would meet key players on Thursday to discuss this issue, as well as the “constant battle” against extremist videos posted online.
Tech firms and social media players are coming under increasing pressure over extremists using their websites, applications and technology to communicate extremist content.
Last year, US authorities fought a legal battle with tech giant Apple to get it to unlock a smartphone used by one of the shooters in a 2015 attack in San Bernardino, California.
The FBI’s own experts ended up breaking into the device.
And Google has faced a boycott by companies whose adverts appear alongside extremist content on its internet platforms, particularly its video-sharing site YouTube.


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London attack investigators demand access to encrypted WhatsApp, used by killer

Participants in the Women's March, gather on Westminster Bridge to hold hands in silence, to remember victims of the attack in Westminster earlier in the week, in London on Sunday. Photo: Reuters

People look at tributes in Parliament Square, London, Saturday March 25, 2017, laid out for the victims of the Westminster attack on Wednesday. Khalid Masood killed four people and left more than two dozen hospitalized, including some with what have been described as catastrophic injuries. The Islamic State group claimed responsibility for the attack. (John Stillwell/PA via AP)

epa05867747 A handout photo made available by the Metropolitan Police in London, Britain on 24 March 2017, showing an image of Khalid Masood, the man behind the terror attack in the Westminster Palace grounds and on Westminster Bridge on 22 March 2017, that left at least five people dead, including the attacker, and more than 31 people injured. Scotland Yard said on 24 March 2017 that police have made nine arrests in relation to the terror attack. EPA/METROPOLITAN POLICE HANDOUT HANDOUT EDITORIAL USE ONLY/NO SALES

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