An attack on one community is an attack on all of us.
Police said they were first called shortly after midnight.
Where did it take place? .
Whether or not the incident was an intentional act of violence against the Muslim community has yet to be known.
The scene is just metres from the main railway line linking London with Edinburgh, the main Arsenal Football Club shop and what was the Rainbow Theatre, considered the prestige London concert venue in the 1960s and 1970s.
The probe in the incident led investigators to the Welsh capital Cardiff, where they searched a property said by media to be the home of Darren Osborne. The elderly man later died, but it is not clear if this was a result of the attack.
Britain's terrorist alert is set at "severe", meaning an attack is highly likely, Sky News reported.
British Prime Minister Theresa May condemned the attack "on innocent people" and declared that Britain would stop at nothing to defeat extremism. Two were in a very serious condition.
According to APP, worldwide media has named the suspect Darren Osborne, father of four, who witnesses said shouted: "I want to kill all Muslims", while mowing down worshippers near a mosque in the Finsbury Park.
Police issued an initial statement at 1.03am saying a vehicle had collided with pedestrians.
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"This is being treated as a terrorist incident and is being investigated by the Counter Terrorism Command". In addition to the attackers, seven people are killed and dozens of others wounded.
Additional officers were deployed, including armed officers, and were at the scene within ten minutes.
"Officers were in the immediate vicinity as the attack unfolded and responded within one minute".
The family of the man held by police over the Finsbury Park attack say they are "massively shocked" and "their hearts go out to the injured".
How did Muslim groups react? .
News said several people were hurt.
"Over the past weeks and months, Muslims have endured many incidents of Islamophobia and this is the most violent manifestation to date".
Eight people were killed and 50 injured on June 3 when three Islamist terrorists drove into pedestrians on London Bridge and stabbed people at nearby restaurants and bars in Borough Market. "These are the values that define this city", she said later outside Downing Street.
After meeting faith leaders at Finsbury Park Mosque on Monday afternoon, she said: 'The bad terrorist attack which took place last night was an evil borne out of hatred and it has devastated a community'. He was later criticized after he launched a Twitter attack on London Mayor Sadiq Khan in the wake of that attack. "We must stand united against hatred and extremism in all it's ugly forms", she tweeted.