London police said the van driver, aged 48, was found detained by members of the public at the scene of the incident. He will be given a mental health evaluation.
The Finsbury Park mosque was associated with extremist ideology for several years after the 9/11 attacks in the United States, but it was shut down and reorganized.
"Muslim communities have been calling for increased action to tackle the growth in hate crime for many years and transformative action must now be taken to tackle not only this incident but the hugely worrying growth in Islamophobia".
The Muslim Welfare House released a statement calling for calm. "It appears from eyewitness accounts that the perpetrator was motivated by Islamophobia", he said.
London Mayor Sadiq Khan, the first Muslim to serve in that position, said extra police would be deployed.
Many at the scene expressed anger that the incident was not reported as a suspected terror attack sooner.
In one video, a group of men are seen holding the suspect to the ground as they call for the police. Speculation has also mounted that there may have been in total three men involved in intentionally running down worshippers, with one in custody and the other two on the run according to the dailymail.
But the leader of the mosque Mohammed Mahmoud guarded him, telling a crowd: "Do not touch him". "No one! No one!"
Police in London said there were a number of casualties and one person had been arrested for an incident on Seven Sisters Road. "It's a very strong Muslim community in this area and what's happening today is I think the people must be extremely, extremely sad", Al-Sulaman said.
As with many areas on the fringes of central London, gentrification has seen the arrival of gourmet coffee shops and refurbished bars. A helicopter circled above the area as a large cordon was established to keep motorists and pedestrians away. "Everybody was shouting: "A van's hit people, a van's hit people", one woman who lives opposite the scene told the media.
The mosque has previously served as a clearing house for radical Muslims after cleric Abu Hamza arrived as imam in 1997. On days when Arsenal football club hosts home matches at the nearby Emirates stadium, the streets around Finsbury Park's transit interchange throngs with fans.
Condemning the incident, Prime Minister Theresa May said: "This is a bad incident", adding, "All my thoughts are with those who have been injured, their loved ones, and the emergency services on the scene". "Eight people injured were taken to three separate hospitals", police said in a statement, adding that two other people were treated for minor injuries.
- Police said they believe the attacker acted alone, despite earlier reports from witnesses, who said they saw two other people flee the scene.
There was also an attack at an Ariana Grande concert in Manchester, where a bomber set off an explosion that killed more than 20 people.