FBI Says It Has Identified ISIS Member from Beheading Videos

ABC News' Pierre Thomas talks to the director of the FBI about the recent development in the war on ISIS.
2:03 | 09/26/14

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Transcript for FBI Says It Has Identified ISIS Member from Beheading Videos
Isis. And the killer who killed two Americans. They know who it is, says the FBI. Pierre Thomas, you spoke directly with the director of the FBI. Yes, I did. The FBI director believes they have identified the Isis radical appearing in the horrific videos. And he had a blunt assessment in a meeting with me and a small number of reporters. This morning, the masked man in this barbaric video speaking in what sounds like a british accent and preparing James Foley for execution has been identified. They declined to name the suspect, but made clear one of the most exhaustive forensic investigations in recent memory has yielded results. FBI and british investigators have deployed a variety of techniques, including face and voice analysis and the study of the terrain at the scene. I think it's going to be extremely difficult to locate him until we degrade their operations a little further. Reporter: The FBI director also confirmed that two men in this new Isis propaganda video are the focus of an intense investigation. The reason? They appear to be speaking in north American accents, meaning potential threats to the homeland. Isis would be looking to respond to U.S. Military action. Quote, if anything, it increases their desire I'm sure to find a way to strike here. And there was a warning about the khorasan, the spin off of Al Qaeda in Syria, planning to attack aircraft with undetectable bombs. He says the plan to attack remains an urgent threat despite them being hit by military strikes. The khorasan was at the top of the list of worries. He is assuming that the military strikes in Syria didn't kill them all. And the threat from them can surface, in his words, tomorrow.

This transcript has been automatically generated and may not be 100% accurate.

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