UK: London attacker used WhatsApp, firm must help police get access

People place flowers outside Britain's parliament in London, Saturday March 25, 2017, 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.(AP Photo/Kirsty Wigglesworth)

LONDON (AP) — Westminster Bridge attacker Khalid Masood sent a WhatsApp message that cannot be accessed because it was encrypted by the popular messaging service, a top British security official said Sunday.

This is an undated photo released by the Metropolitan Police of Khalid Masood. Authorities identified Masood, a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (Metropolitan Police via AP)

British press reports suggest Masood used the easily available messaging service just minutes before starting a rampage Wednesday that left three pedestrians and one police officer dead and dozens more wounded, including some with catastrophic injuries.

Home Secretary Amber Rudd used appearances on BBC and Sky News to urge WhatsApp and other encrypted services to make their platforms accessible to intelligence services and police trying to carrying out lawful eavesdropping.

“We need to make sure that organizations like WhatsApp — and there are plenty of others like that — don’t provide a secret place for terrorists to communicate with each other,” she said.

Rudd did not provide any details about Masood’s use of WhatsApp, saying only “this terrorist sent a WhatsApp message and it can’t be accessed.”

But her call for a “back door” system to allow authorities to access information is likely to be met with resistance throughout the industry. In the United States, Apple fought the FBI’s request for the passcodes needed to unlock an iPhone that had been used by one of the perpetrators in the 2015 extremist attack on San Bernardino, California.

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)

Masood drove a rented SUV into pedestrians on Westminster Bridge before smashing it into Parliament’s gates and rushing onto the grounds, where he stabbed a policeman to death before he was shot dead. A detailed police reconstruction has found the entire attack lasted 82 seconds.

Police say he acted alone but they are trying to pinpoint his motive and identify any possible accomplices, making the WhatsApp message a potential clue to his state of mind and his social media contacts.

Rudd said attacks like Masood’s would be easier to prevent if authorities could penetrate encrypted services after obtaining a warrant similar to the ones used to listen in on telephone calls or — in snail mail days — steam open letters and read their contents.

Without a change in the system, she said terrorists would be able to communicate with each other without fear of being overheard even in cases where a legal warrant has been obtained.

Rudd also urged technology companies to do a better job at preventing the publication of material that promotes extremism. She plans to meet with firms Thursday in a bid to set up an industry board that would take steps to make the web less useful to extremists.

British police investigating the attack say they still believe Masood, a 52-year-old Briton, acted alone and say they have no indications that further attacks are planned.

Deputy Assistant Commissioner Neil Basu said it may never be possible to fully determine Masood’s motives.

“That understanding may have died with him,” Basu said Saturday night as police appealed for people who knew Masood or saw him to contact investigators. “Even if he acted alone in the preparation, we need to establish with absolute clarity why he did these unspeakable acts, to bring reassurance to Londoners.”

The Islamic State group, which is losing territory in Iraq and Syria but still has radical followers in other parts of the world, has claimed Masood was a “soldier” carrying out its wishes to attack Western countries.

Masood had convictions for violent crimes in the U.K. and spent time in prison. He also worked in Saudi Arabia teaching English for two years and traveled there again in 2015 on a visa designed for religious pilgrimages.

One 58-year-old man remains in custody in the case after being arrested in Birmingham, where Masood had been living. He has not been charged or named. Nine others arrested after the assault have been freed without charges and one has been freed on bail.

The family of slain police officer Keith Palmer, meanwhile, released a statement thanking those who tried to save his life.

“There was nothing more you could have done. You did your best and we are just grateful he was not alone,” the statement said.

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