James Foley beheading suspect probably British, David Cameron says

The PM said James Foley's killing was "deeply shocking" but warned it was "not a time for a knee-jerk reaction".
He also said the government would "redouble" efforts to stop Britons travelling to fight in Iraq and Syria.
Mr Foley, 40, had been missing since he was seized in Syria in 2012.
The extremist group, Islamic State (IS), posted footage of the killing online, which has since been verified by the White House.
The Metropolitan Police has warned that "viewing, downloading or disseminating" the vid

eo might be an offence under terrorism laws.
'Resolve and patience' Speaking in the US, Mr Foley's father, John, said he was deeply shocked at the death of his son and called him a "martyr for freedom".

President Barack Obama condemned the killing as "hateful" and pledged the US would be "vigilant and relentless" and "do what is necessary to see that justice is done".

Mr Cameron, who returned from holiday to chair emergency meetings with Home and Foreign Office officials, said the killer had not yet been identified but said it was "deeply shocking" that he appeared to be British.
"Let's be clear what this act is - it is an act of murder, and murder without any justification," he told BBC political editor Nick Robinson.
The PM said "far too many" British citizens had travelled to Syria and Iraq to take part in the fighting there and the government would "redouble all our efforts" to stop people going.
Mr Cameron reiterated that the UK would not get involved in another Iraq war and there would be "no combat boots on the ground".
The fight against Islamic extremism required "resolve" and "patience", he added.
Proposals for "even tougher laws" would be looked at, he said, but there would be no knee-jerk reaction.

David Cameron returned from holiday to chair meetings

The video footage of Mr Foley, titled A Message to America, shows the journalist wearing an orange jumpsuit, kneeling in desert-like terrain beside an armed man dressed in black.
The masked militant, who speaks with an English accent and identifies himself as an IS member, says the journalist's death is in retaliation for US attacks on IS in Iraq.
After he speaks, the militant appears to start cutting at his captive's neck before the video fades to black.
Mr Foley's body is then seen on the ground.
Atrocities Foreign Secretary Philip Hammond said: "We're absolutely aware that there are significant numbers of British nationals involved in terrible crimes, probably in the commission of atrocities, making jihad with Isil [now known as IS] and other extremist organisations.
"This is something we have been tracking and dealing with for many many months and I don't think this video changes anything."
It is estimated that IS, which has seized large parts of northern Iraq and Syria, has up to 400 recruits from the UK in its ranks.
Some 69 people suspected of Syria-related jihadist activities have been arrested in the UK.