Investigations into the identity of an English-speaking man who featured in an ISIL group video are focusing on a Briton, Siddhartha Dhar, the BBC reported Tuesday.

Investigations into the identity of an English-speaking man who featured in an ISIL group video are focusing on a Briton, Siddhartha Dhar, the BBC reported Tuesday.

Dhar was born a Hindu and ran a business renting out bouncy castles in northeast London before converting to Islam and becoming radicalized, the broadcaster said.

It cited an unnamed official source as saying that Dhar was the main suspect, although Britain's intelligence services never comment on the record about their investigations.

On Sunday, ISIL released a video featuring a masked fighter carrying a gun and speaking English which showed the killing of five "spies" it said had worked with the international coalition fighting ISIL terrorists in Iraq and Syria.