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Who is the masked man with a British accent fronting a new ISIS execution video? Clues emerging in the United Kingdom.

FOX's Simon Owen reports from London:

Officially, there's no word on the identity of a man seen criticizing the British Prime Minister before taking part in the killings of five hostages.

But unofficially, the chief suspect in British news reports is a man from London named Abu Rumaysah, who used to make a living selling bouncy houses...

(Ali) "I could make the connection straight way, you know, I could tell that it's his voice."

Documentary maker Mojtaba Ali, who interviewed Rumaysah two years ago, says he was an extremist who liked attention.

Rumaysah was already known to security services here. He took his family to Syria in 2014, around 800 Britons are thought to have made the journey.

In London, Simon Owen, FOX News.