Prime Minister David Cameron: 'Increasingly Likely' Foley's Murderer British (VIDEO)

At the Telegraph UK:

David Cameron cut short his holiday to return to Downing Street and oversee the response after the horrific video was posted online.
Speaking to reporters in Number 10, Mr Cameron said it seemed "increasingly likely" that a British citizen was the killer.

"Let me condemn the barbaric and brutal act that has taken place and let's be clear what this act is - it is an act of murder, and murder without any justification," he said.

"We have not identified the individual responsible, but from what we have seen it looks increasingly likely that it is a British citizen.

"This is deeply shocking. But we know that far too many British citizens have travelled to Iraq and travelled to Syria to take part in extremism and violence. And what we must do is redouble all our efforts to stop people from going. To take away the passports of those contemplating travel, arrest and prosecute those who take part in this extremism and violence. To take extremist material off the internet and do everything we can to keep our people safe. And that is what this Government will do."