A 48-year-old man has been arrested in connection with the attack Who was behind it?
The attack occurred about 12:20 a.m. when a speeding van swerved into worshippers who were giving first aid to a man outside the mosque.
- London Mayor Sadiq Khan called the incident "a horrific terrorist attack". "We don't yet know the full details, but this was clearly a deliberate attack on innocent Londoners, many of whom were finishing prayers during the holy month of Ramadan", Khan said.
"While this appears to be an attack on a particular community, like the awful attacks in Manchester, Westminster and London Bridge it is also an assault on all our shared values of tolerance, freedom and respect", he said in a statement.
London, one of Europe's great cities, is in the midst of the sort of crisis not seen since the 7/7 bombings in 2005.
The incident follows only weeks after three Islamic attackers drove a van into pedestrians onLondon Bridge and then went on a knife rampage through busy Borough Market, killing eight people.
The incidence happened near two close mosques the Muslim Welfare House and Finsbury Park Mosque.
The population in the streets surrounding the scene of the attack is one of the most diverse in the capital, with Orthodox Jews living alongside Muslim communities from Algeria, Somalia and West Africa in a traditionally working class district fast undergoing the effects of gentrification.
She said her thoughts were with the injured, their loved ones and emergency officials who responded to the incident. The attacker was motivated by Islamist extremism, police said.
Witnesses reported seeing two other men who had been inside the van run away, but police are yet to confirm if others were involved in the attack. We're not safe. If I stay here, people could come and attack me with a vehicle.
"I think it's also something, in the case of Islamophobia, there are extremists again who are driving hatred, who are using language about cleansing Britain of Islam, who are talking about a final solution for Muslims", he said. In a tweet, the Muslim Council of Britain condemned the incidence and wished victims quick recovery. "In exactly the same way as previous recent attacks it is a crime against God and against humanity".
After a 2003 raid by police investigating a ricin plot, the Finsbury Park Mosque was shut down - though Hamza had already been forced out by other members, and was reduced to addressing his followers in the street outside.
They added: "We call on the government to do more to tackle this hateful evil ideology which has spread over these past years and resulted in an increase of Islamophobic attacks and division of our society, as well as spreading of hate".
London Ambulance Service sent "a number of resources" to the incident.
She said: "Whatever made this man act as he did, people don't feel like that in this area".
On May 22, a suicide bomber killed 22 people at a concert by American pop singer Ariana Grande in Manchester.