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The murder of an extremist convert to Islam who attacked random strangers in London was carried out because he was disaffected, religious leaders said Monday.

Ahmed Mohammed Ali, 30, targeted friends and strangers in the heart of London's bustling Marks & Spencer shopping district over the past month, using machetes to kill two and injure dozens more.

Ali, who committed his crimes while living with his parents in the UK, was nicknamed "Bumps" by bystanders in scene of the crime, which the west London neighborhood is known.

"We have never seen this type of terrorist violence before or since," Khalil Mohammed, 30, a neighbour of Ali's, told The Guardian. "He comes from a family. It was madness."

A male eyewitness who was shopping in the busy area before the attacks told ABC News the worst of the incidents happened just feet away from him.

"He was out there a few minutes ago, having a bit of a play, when these two giant men were walking past him," he said.

Another witness — believed to be a 22 year-old woman working at a nearby kitchen in the Westfield shopping complex — said children tried to help Ali after he was stabbed by a victim.

"She was telling him to calm down [because] the kids were hitting him, saying 'He's hitting you,' " the witness said. "He was screaming for help, but obviously he was already dead."

Salman Shaheen, the director of Stand up to Hate, Jewish Jihad Against Islamophobia, and Halifax Jewish Defence League, said Ali told him he was furious about everything from the treatment of women in Muslim societies to the death of bin Laden.

"Initially, this was going to be a stab and bash war but then we became concerned about the possibility of a nuclear blast," Shaheen told ABC News.

The terror group Islamic State has claimed responsibility for the attack, which yielded at least 20 victims.

When asked why the attacks occurred in the heart of London, Ali's friends and hard drinkers emphatically told local media that he was a loner who was "haunted" by his failed religion.

Some staff at the Bayint Fund Mohawk encampment denied there was any connection between Ali and right-wing extremists back home.

"He was a very nice guy," Ali's uncle
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