Police and security services are working to identify British nationals returning to jihad, which appears in the footage of the execution of American journalist.
The extremist group Islamic State published a video of the moments before and after the execution of James Foley, who was beheaded.
Unconfirmed reports suggest that the person in the video, which had a strong English accent, is from London or the south-east of England and has served as a guard hostage-it IS.
James Foley, 40, was declared missing since 2012, when he was kidnapped in Syria. Learned that the FBI is leading the international hunt to catch the killer, while Scotland Yard is examining the content of the videos.
Since the footage was published, American forces have carried out 14 air strikes against militants it IS dam near Mosul in northern Iraq.
Fighting continued in the area since the Kurdish and Iraqi forces regained control of the strategic facility earlier this week, after having fallen into the hands of militants.
British Prime Minister David Cameron said how come the more likely that person is British American journalist executed, but added that it is time for intemperate reactions.
Mr Cameron, who cut his holiday on Wednesday, is expected to return to his native Cornwall, but will continue to receive calls and reports. The BBC reports that the person who appears in the film footage is believed to have traveled to Syria in the past three years.
While "The Guardian" says that the person thought to be the chief of a British-based guerrilla group in Syria. According to the newspaper, he identified with the name "John" and believed to be from London.
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