Shortly after midnight, the hired vehicle swerved into a group of people leaving prayers at the Muslim Welfare House and the nearby Finsbury Park Mosque in north London, one of the biggest in the country, witnesses said.
"This had all the hallmarks of a terrorist incident," said Neil Basu, senior national co-ordinator for counter-terrorism policing. "This was an attack on London and all Londoners."
If confirmed by the authorities as terrorism, it would be the fourth attack since March in Britain and the third to involve a vehicle deliberately driven at pedestrians.
The attack comes during the Muslim holy month of Ramadan when Muslims were attending special prayers. Abdulrahman Aidroos said he and his friends had been tending an old man who had suffered a heart attack when the van was driven at them.
"When he was running he was saying 'I wanna kill more people, I wanna kill more Muslims'," he told BBC TV. He said he had helped tackle the driver and pin him down with others until police arrived.Read more at Reuters