Hunt is on for suspected British jihadi in James Foley execution video

An international manhunt is under way for the fighter shown in a video of the beheading of journalist James Foley -- and its focus is on Britain.

The Islamic State militant on the video has his face covered, except for his eyes. But he has what appears to be a distinctly British accent.

UK media reports are rife with speculation about where he's from. Linguistics experts say his accent indicates he is from southeast England or London, perhaps the capital's East End.

As news of the cold-blooded execution of Foley emerged, UK Prime Minister David Cameron interrupted his summer vacation to head a meeting of the government's emergency committee, known as COBRA, in London.

Speaking to the media, he condemned the killing as "a murder without any justification" and said that while the man has not been identified, "it looks increasingly likely that it is a British citizen."