Though authorities have not released how many people were injured as a result of the van striking pedestrians, they have said that there are a "number of casualties".
Similarly, London's Metropolitan Police spokesman said that it was "too soon to say" if the incident was indeed a terrorist attack.
One witness said that a van had hit about ten people returning from Finsbury Park mosque.
One person has been arrested.
"The leader of the mosque will release a statement later but right now safety is our concern".
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"Our priority is to assess the level and nature of injuries and ensure those in the most need are treated first and taken to hospital".
It is unclear whether the incident in Finsbury Park is terror-related. The MSB said earlier that the attack was directed at Muslims leaving Ramadan night prayers.
An eyewitness told Reuters that police have sealed off the road.
British Prime Minister Theresa May was informed of the incident about 3:00am local time. The London Ambulance Service tweeted: "We've sent a..."
Britain's terrorist alert has been set at "severe" meaning an attack is highly likely.