Police have not yet determined whether the fatality was a result of the van attack.
"I offer my condolences to the family and friends of the man who has died, and our thoughts are with the people who have been injured, their family and friends".
"Our imam, Mohammed Mahmoud, went there and saved him".
Eight people were injured during the attack and taken to three area hospitals.
- The Archbishop of Canterbury, Justin Welby, said "the appalling attack on Muslims in Finsbury Park is an attack on us all and on the culture and values of our country". The mosque called it a "callous terrorist attack".
London Mayor Sadiq Khan urged people to "remain calm and vigilant" and said the Met had deployed extra police to reassure communities, especially those observing Ramadan.
Following the attack, Simon Johnson of the Jewish Leadership Council said: "We utterly condemn this vile, terrorist attack at the Finsbury Park Mosque last night".
"Any causative link between his death and the attack will form part of the investigation".
West Mids Emergency Services React To Finsbury Park Terror Attack
Where did it take place? Manchester was also hit on May 22 when a suicide bomber killed 22 people at an Ariana Grande concert. Basu thanked those who detained the driver, adding: "Their restraint in the circumstances was commendable".
Kozbar complained that the "mainstream media" was unwilling to call the attack a terrorist incident for many hours.
Someone in the crowd yelled to others not to harm the man while he was taken into custody.
He said: "The leader of the mosque said "You do not touch him". No one! No one!"
Finsbury Park mosque was associated with the radical cleric Abu Hamza until 2005, when it was taken over by new management.
Prime Minister Theresa May said the incident is being treated as a "potential terrorist attack".
Numerous victims are believed to have just left evening prayers at the Muslim Welfare House after breaking the Ramadan fast. He is expected to attend prayers at Finsbury Park mosque today.
"When he got arrested, he was taunting, saying, "I'd do it again, I'd do it again".
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He said: "During the night, ordinary British citizens were set upon while they were going about their lives, completing their night worship".
"He wanted to run away and was saying "I want to kill Muslims".
The 48-year-old driver of the vehicle has been arrested and police aren't looking for anyone else.
The attack will stretch the capacity of authorities in Britain, who have faced four attacks in recent months, together with a major fire that has killed dozens. Ten other people were injured.
"We stopped him until the police came", he said. The UK has been on high alert after a series of attacks.
A video that emerged from Finsbury Park, London shows a white man near a police van. "There has been one person arrested".
The crash occurred near the Finsbury Park mosque. He said that as members of the public seized the driver, "he was shouting, 'all Muslims, I want to kill all Muslims.' Literally, he said that".
Although one witness told Sky News that two other people fled the scene, police said there were no other suspects at present but that the investigation is in its early stages. "Our prayers are with the victims".
London Police Treat Mosque Attack as Terrorist Incident
The incident comes at a time when emotions are high in the United Kingdom , in the wake of a series of deadly terrorist attacks. London police say one suspect has been detained in an apparent early-morning attack on worshippers standing outside a mosque.
Transport for London says Seven Sisters Road has been closed northbound between Hornsey Road and Rock Street. Many police cars and ambulances responded to the incident.
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