A spokesperson for the Zionist Federation condemned the "ugly attack", adding that "terrorism is terrorism whether it comes from the far-right, Islamists or any other form of extremism", urging everyone to "stand together in the fight against hatred".
Among those known to have worshiped at the mosque during Abu-Hamza's time there are convicted shoe bomber Richard Reid and Zacarias Moussaoui, the so-called 20th hijacker of September 11. "He targeted Muslims this time", the witness, identified only as Rayan, said.
As with many areas on the fringes of central London, gentrification has seen the arrival of gourmet coffee shops and refurbished bars.
A map of the Finsbury Park area of north London.
A white van rammed a group of faithful coming out of a North London Mosque, killing one person and injuring eight.
Metropolitan Police Deputy Assistant Commissioner Neil Basu said police are investigating whether the death of the man getting first aid was a direct result of the attack, but it was too early to say for sure. Two other people were treated at the scene for minor injuries.
Since March, there have been five other planned attacks of which two were prevented and three carried out - in Westminster, Manchester and London Bridge.
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The driver of the van was a 48-year-old man, who has been arrested and detained by police.
Prime Minister Theresa May is due to chair an emergency meeting on Monday morning, after police confirmed the incident was being treated as a "potential terrorist attack", she said.
"We don't yet know the full details, but this was clearly a deliberate attack on innocent Londoners, many of whom were finishing prayers during the holy month of Ramadan", Khan said.
The Finsbury Park mosque's chairman, Mohammed Kozbar, called the incident a "cowardly attack" in a statement on on Twitter. The local MP is Jeremy Corbyn, the leader of the UK's main opposition Labour Party.
He said: "While this appears to be an attack on a particular community, like the bad attacks in Manchester, Westminster and London Bridge, it is also an assault on all our shared values of tolerance, freedom and respect".
All the victims of a van attack on worshippers near a north London mosque were Muslim but the man who died at the scene may have been taken ill before it happened, police said on Monday.
"From the window, I started hearing a lot of yelling and screeching, a lot of chaos outside ..."
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Resident Cynthia Vanzella said said she was in bed when she heard people shouting. And then the guy came out of his van and I got him.
One witness, Abdul Rahman, told the BBC he saw the van "deliberately run over about 10 or 15 people".
Abdulrahman claimed the driver said "Kill me", as he was being held on the ground.
It is unclear whether this was the same person in custody or another person in the van who may have fled the scene. "I want to kill more Muslims", the driver shouted, according to witnesses. "Our prayers are with the victims", it said.
While there is no official confirmation of how many people have been injured, the police and the Ambulance Service have said there are a number of casualties.
Harun Khan, the head of the MCB, described the incident as the "most violent manifestation to date" of Islamophobia, and called on authorities to do more "to tackle the growth in hate crime".
The attack comes just two weeks after the terror attack on London Bridge, where jihadis used a hired van to mow people down before stabbing revellers in nearby Borough Market.
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