One man died at the scene, although he was receiving first aid at the time and it wasn't clear if he died as a result of the attack or from something else.
Police are treating the incident as a terror attack. The chaos outside the Finsbury Park Mosque follows three Islamist-inspired attacks over the past three months that have triggered a surge in hate crimes around Britain.
Police will assess the security of mosques and provide any additional resources needed ahead of celebrations marking the end of the holy month of Ramadan, Prime Minister Theresa May announced.
"This was an attack on Muslims near their place of worship," she said in a televised address. "And like all terrorism, in whatever form, it shares the same fundamental goal. It seeks to drive us apart and to break the precious bonds of solidarity and citizenship that we share in this country. We will not let this happen."
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Police said the 48-year-old white man who drove the van has been arrested on suspicion of attempted murder. A mob surrounded the man and witnesses said the crowd began attacking him. A local imam, Mohammed Mahmoud, organised some "brothers" and shielded the man until police could take him away.
"By God's grace, we were able to protect him from harm," he said.
Toufik Kacimi, chief executive of the Muslim Welfare House, speaking to Sky News, said the attack clearly targeted Muslims leaving evening prayers during Ramadan.
But Kacimi said there was no need for the community to panic, because police and government officials have been "very, very supportive."
"At this stage, we are calling for calm," he said. Mayor Sadiq Khan, London's first Muslim mayor, urged residents to focus on their shared values and to stand together during an unprecedented period in the capital's history. The attack Monday hits a community already feeling targeted in the fallout from the London Bridge killings and other attacks blamed on Islamic extremists.
"While this appears to be an attack on a particular community, like the terrible attacks in Manchester, Westminster and London Bridge, it is also an assault on all our shared values of tolerance, freedom and respect," Khan said.
Vowing "zero tolerance" for hate crimes, Khan declared "we will not allow these terrorists to succeed ... We will stay a strong city."
The attack laid bare the frustrations of Muslims who feel they've been unfairly equated with the extremists who carry out atrocities in the name of Islam. Early police caution about declaring the incident terrorist-related was interpreted by the community as discriminatory.
"There has been an outpouring of sympathy for all for the recent terror attacks but hardly a whisper on this attack," he said. "People are both scared and angry. Parents are scared to send their children to evening prayers. I don't think people understand how much these attacks affect all of us.
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