FBI has Identified 'Jihadi John' seen in ISIS execution videos but will not reveal his nationality or Identity.

The FBI has identified the ISIS executioner who appears in the beheading videos of US journalists James Foley and Steven Sotloff, and British aid worker John Haines.
Agency director James Comey told reporters today that he knew who the militant was but would not be releasing his identity or nationality to the media.

The executioner, who has a British accent and has been dubbed Jihadi John, is one of four British jihadis known as the 'Beatles' holding hostages in Syria.

He appears in the group’s execution videos wielding a knife and taunts President Obama before carrying out the killings
Today British officials would not say if the identity had been shared with the authorities on London, and would not be drawn on whether any arrests are imminent.

A Home Office spokeswoman said: 'We won't be commenting on matters of security at this stage.'  

Read more after the cut.

Comey said the FBI believes that ISIS is 'looking to try to do something in the U.S.,' but added he did not believe the group is capable of a sophisticated or complex attack.

During questioning from reporters at the FBI headquarters Comey also spoke about Khorasan group, an al Qaeda affiliate who were targeted along with ISIS by American airstrikes in Syria earlier this week.

He said he was 'not confident at all' the threat from Khorasan militant group was thwarted by the airstrikes.

'We don't have complete visibility about their activities.

'We believe they've been working toward an attack, but it's hard to say whether it would come tomorrow, in three weeks, or in three months,' he said.

FBI Director James Comey (pictured) told reporters today that he knew who the militant was but would not be releasing his identity or nationality to the media. The executioner, who has a British accent,  is one of four British jihadis known as the 'Beatles' holding hostages in Syria.