Chat apps that promise to prevent your messages being accessed by strangers are under scrutiny again following last week's terror attack in London.

On Sunday, the home secretary said the intelligence services must be able to access relevant information.

Her comments followed the discovery that Khalid Masood appeared to have used WhatsApp minutes before carrying out his killings.

There are doubts about whether that action was related to the atrocity.

BBC home affairs correspondent Danny Shaw has highlighted that the police had declared that they believed Masood had acted alone on the day, and would not have done so unless they had accessed and read messages stored on his phone.

Even so, the home secretary has summoned WhatsApp's owner, Facebook, and other technology companies to a meeting on Thursday to discuss ways to ensure that security officers get the data they need in the future.

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BBC News