Prime Minister David Cameron has said he is "not ruling anything out" with regard to the Islamic State (IS) insurgency in Iraq and Syria.
He told Good Morning Britain that it was vital that any steps taken by western powers were not "over the head" of local efforts to combat IS.
David Cameron: "I am certainly not ruling anything out and I will always act in the British national interest."
David Cameron: "The first thing we should do...is to help those on the ground that are fighting this organisation."
I've been told at the Nato summit that the intelligence services know exactly who 'Jihadi John' is - or at least are 99.9% certain.
The British aid worker being held by Islamic State is David Haines, a 44-year-old father-of-two from Perth, Scotland.
In a video statement which claims to record his final words US hostage and journalist Steven Sotloff blames US foreign policy for his death.