Militant in Syria beheading videos identified - FBI

A video purportedly showing U.S. journalist Steven Sotloff kneeling next to a masked Islamic State fighter holding a knife in an unknown location in this still image from video released by Islamic State September 2, 2014. REUTERS/Islamic State via Reuters TV

WASHINGTON (Reuters) - A masked Islamic State militant seen wielding a knife in videos at the beheading of two Americans has been identified, FBI Director James Comey said on Thursday, but he declined to give the person's name or nationality.

The videos released in August and September of American journalists James Foley and Steven Sotloff showed a masked Islamic State militant brandishing a knife and speaking English with a British accent.