By Brian Ross and Rhonda Schwartz, ABC

“Jihadi John,” the British-accented man who appeared in all black in several ISIS videos in which he appeared to behead Westerners, has been identified as Londoner Mohammed Emwazi, a former senior intelligence official confirmed to ABC News.

The Washington Post and BBC first reported the name early Thursday, with the Post citing a close friend who said he or she has “no doubt” that Emwazi is the man. A former senior U.S. intelligence official who was involved in the hunt for the man confirmed the name to ABC News.

The Post described Emwazi as being from a “well-to-do” family in London, a man who graduated the University of Westminster with a computer programming degree. The university released a statement acknowledging someone by the name left college six years ago.

British authorities have declined to comment on the man’s identification. Commander Richard Walton of the London Metropolitan Police’s Counter Terrorism Command (SO15) told BBC, “We have previously asked media outlets not to speculate about the details of our investigation on the basis that life is at risk.”

A spokesperson for the White House National Security Council said they “are not able to confirm or deny” the reports on “Jihadi John’s” identification, and referred questions to the British government.

“The U.S. government continues to investigate the murder of American citizens by ISIL [ISIS],” the NSC said. “As the President said, no matter how long it takes, the United States will not rest until we find and hold accountable the terrorists who are responsible for the murders of our citizens.”

The man who would be come to be known as “Jihadi John” first appeared in a string of disturbing videos produced by ISIS last August in which he appeared to slice the necks of Western hostages, including American journalists James Foley and Steven Sotloff. By September, the FBI said it had learned “Jihadi John’s” identity, but it was not revealed to the public.

A spokesperson for the Sotloff family said today the family is “confident law enforcement would find him and bring him to justice and they have full confidence the U.S. government will be able to do that.”

“They would like to see him brought to a court in New York or eastern Virginia and watch him prosecuted by a U.S. court for beheading their son and convicted to life in a super max facility,” spokesperson Barak Barfi said. “This is how justice is served in this country.”

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