Many local Muslim worshippers complained that police did not immediately treat the incident as a terrorist attack, saying they would have treated it differently if it had been an Islamist attack.
Mrs May said police would continue to assess the security needs of mosques and would provide whatever additional resources were needed.
He said: 'Officers were in the immediate vicinity as the attack unfolded and responded instantly. "All the police and helicopters came after around eight minutes".
One man died at the scene and 10 people were injured.
Mr Basu said eight people are in hospital and two others were treated at the scene.
According to police, all of the victims were Muslims.
Police arrested the van's driver, but were trying to determine whether the collision was accidental or deliberate.
London police - already stretched by a series of tragedies including a June 14 high-rise apartment fire in which 79 people are presumed dead and a June 3 terror attack near London Bridge that killed seven people - said they are putting more officers on the street to reassure the public.
(AP Photo/Tim Ireland). A van is seen near Finsbury Park station after the vehicle struck pedestrians in north London, Monday June 19, 2017.
Harum Khan, secretary general of the Muslim Council of Britain, said: "My prayers are with the victims and their families".
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- The driver of the van, a 48-year-old man, was held by people at the scene until police could arrest him.
"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".
A Reuters witness saw at least one person being loaded into an ambulance.
Witnesses described hearing the van driver, who was detained by members of the public at the scene, shout: "I'm going to kill Muslims". Many worshipers were leaving the mosque as part of midnight prayers during the Ramadan observance of the Muslim religion. He complained that the "mainstream media" was unwilling to call the attack a terrorist incident for many hours.
The Finsbury Park mosque is famous because in the 2000s it was a place of radical Muslims, inflamed by the sermons of Abou Hamza, an Egyptian, now sentenced to life imprisonment in the United States for terrorism.
The mosque's current leaders say they support inter-faith dialogue and want to serve the nearby community in north London, which is located near Emirates Stadium, home of the Arsenal soccer club.
"Add to that anti-Muslim sentiment and you may have what lies behind the attack on a group of people leaving the mosque after evening prayers in London on Sunday".
Between two vehicle-and-knife rampages on London and Westminster bridges, and a suicide bombing outside an Ariana Grande concert in Manchester, 33 people have been killed since March.
On March 22, a man killed five people after he drove a auto into pedestrians on Westminster Bridge in London and stabbed a policeman to death.


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