The Muslim Council of Britain said the vehicle had hit people as they were leaving Finsbury Park mosque.
Police said they were called just after 12:20 a.m. (2320 GMT Sunday) to reports of a collision on Seven Sisters Road, which runs through the Finsbury Park area of the city.
"There was this white van stopped outside Finsbury Park mosque that seemed to have hit people who were coming out after prayers had finished.
On March 22, a man drove a rented car into pedestrians on Westminster Bridge in London and stabbed a policeman to death before being shot dead.
On May 22, a suicide bomber killed 22 people at a concert by American pop singer Ariana Grande in Manchester in northern England.