AN INTERNATIONAL manhunt has been launched for a suspected British jihadist believed to have carried out the videoed beheading of US journalist James Foley.

Spooks yesterday began sifting through the footage for clues amid growing evidence that the black-clad Islamic State (Isis) extremist — identified by a former hostage as “John” — is from London.

It comes after Prime Minister David Cameron confirmed that it is “increasingly likely” that the killer was a British citizen.