Police said the 48-year-old man who was driving the vehicle has been arrested and taken to a hospital as a precaution.
"We saw lots of people shouting and lots of people injured", David Robinson, 41, who arrived just after the accident, told AFP.
"If this attack is confirmed as a deliberate terrorist attack then this should be classed as an act of terrorism", said Mohammed Shafiq, head of the Ramadhan Foundation community group.
Abdulrahman claimed the driver said, 'kill me, ' as he was held on the ground.
May says police are treating the crash as a potential terrorist attack.
Theresa May condemned the attacks on Muslims outside Finsbury Park Mosque on Monday calling it "sickening".
London, Jun 19 An imam today protected from an angry mob the attacker who ploughed his van into worshippers outside a mosque in London, killing one person and injuring ten others.
Hussain Ali, 28, told the Press Association, a British news agency, that the leader of the mosque told the crowd "do not touch him" as they waited for the police to arrive.
The victims are believed to have been breaking fast at a cafe next to the mosque following late-night prayers observed during the Islamic holy month of Ramadan.
"A number police units are at, and managing the cordons around, the crime scene, including local officers and those from neighbouring boroughs - supported by armed officers and the Territorial Support Group".
In a statement Monday, London Mayor Sadiq Khan called the incident a "horrific terror attack".
Amateur video footage seen by AFP showed at least three people lying on the ground, including one who was receiving mouth-to-mouth resuscitation.
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Over lunch with senators on Tuesday, he complained that it was "mean" and urged the senators to pass a more compassionate bill. Dean Heller - the Republican who is likely in the most danger of losing his seat in the 2018 midterms - as well as Alaska Sen.
"Our priority is to assess the level and nature of injuries and ensure that those most in need are treated first and taken to hospital".
Toufik Kacimi, chief executive of the Muslim Welfare House, speaking to Sky News, said the attack clearly targeted Muslims, who were leaving evening prayers during Ramadan. "Thank God I just moved to the side, I just jumped", the witness added. It was a lot of police, a awful scenario really - I hope it will never happen again.
He added: "I said, 'tell me why did you try driving to kill innocent people?'"
Prime Minister Theresa May plans to chair an emergency meeting of top security and government officials this morning to discuss the attack.
"Reassurance they are free to practise their faith, they are free to walk about the streets, and people must be able to do that", he said.
"Shocked and outraged to hear a van has intentionally run over worshippers leaving Ramadan prayers on Seven Sisters Road", he said.
Police said a man who was driving the vehicle has been arrested and taken to a hospital as a precaution.
British Home Secretary Amber Rudd says police "immediately" treated a fatal incident outside a London mosque as a suspected terrorist attack.
Londons transport authority said on Twitter that the Seven Sisters road had been closed due to an "emergency services incident".
It also follows a suicide bombing at a pop concert in Manchester, northern England, in May which killed 22, while in March, a man drove a rented auto into pedestrians on Westminster Bridge in London and stabbed a policeman to death before being shot dead.
Two weeks earlier, a suicide bomber killed 22 people at a concert by American pop singer Ariana Grande in Manchester in northern England.
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