"Jihadi John", the masked Islamic State group militant apparently responsible for beheading Western hostages, has been named as Kuwaiti-born London computer programmer Mohammed Emwazi.
A Washington Post report on Thursday citing friends, a leading think-tank researching foreign jihadists and a British security official quoted by the New York Times identified Emwazi as being the executioner.
The International Centre for the Study of Radicalisation at King's College in London said it believed the identity "to be accurate and correct".
"We're pretty confident that the right individual has been named," Shiraz Maher, a senior research fellow at the centre, told AFP.
He predicted that his apparent unmasking would deal a "psychological blow" to the IS group.
"They'll feel somewhat deflated that someone they wanted to preserve and protect as an asset has been outed in this way but it won't change anything day to day," Maher added.
London's Metropolitan Police dismissed the reports as "speculation" and said it was "not going to confirm his identity" to protect human lives.
Cage, a civil rights group that was in contact with Emwazi for years over his alleged harassment by British security services, said that while not 100 per cent certain, they believed it was him.
"Jihadi John" is believed to be responsible for the murders of US journalists James Foley and Steven Sotloff, British aid workers David Haines and Alan Henning and American aid worker Abdul-Rahman Kassig.
He also appeared in a video with Japanese hostages Haruna Yukawa and Kenji Goto shortly before they were killed.
In the videos posted online, he appears dressed all in black with only his eyes exposed, brandishing a knife while launching tirades against the West.
Haines's daughter Bethany told ITV News that her family and those of other victims would "feel closure and relief once there's a bullet between his eyes".
Cage's research director Asim Qureishi described Emwazi as a "beautiful young man" who had been alienated by his treatment at the hands of the British security services.
Cage published correspondence with Emwazi in which he alleged a British MI5 secret service agent named "Nick" tried to recruit him while interrogating him at Amsterdam's Schiphol Airport in 2009.
Emwazi said he was returning with two friends after they were expelled from Tanzania, accused of trying to join Islamist militants in Somalia but on a trip that he claimed was a safari holiday after finishing university.
After refusing, he said the officer told him: "You're going to have a lot of trouble, you're going to be known, you're going to be followed."
After being refused entry to Kuwait three times, Cage said Emwazi left his London home in 2013 and that four months later, police told his family he had entered Syria.
Emwazi, said by Cage to be 26, was identified to the Post by friends and others familiar with the case, with one acquaintance telling the paper: "I have no doubt that Mohammed is Jihadi John".
Qureishi said Emwazi's family did not believe the allegations against their son and were in a state of "absolute shock".
The University of Westminster said in a statement it had a record of a Mohammed Emwazi leaving college six years ago.
"If these allegations are true, we are shocked and sickened by the news. Our thoughts are with the victims and their families," it said.
Cage claimed that Emwazi had "desperately wanted to use the system to change his situation but the system ultimately rejected him."
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