Prime Minister Theresa May says the terror attack near a north London mosque is “every bit as sickening” as other recent ones to hit the UK.
She was speaking after a man died and 10 people were injured when a man drove a van into worshippers outside the Muslim Welfare House.
Eight people were taken to hospital after the attack outside the mosque, which is also a community centre.
A 48-year-old man has been arrested on suspicion of attempted murder.
According to BBC News, a group of people were helping a man who had collapsed when they were hit by the van just after midnight. The man has died, but it is unclear whether this was as a result of the attack.
This is the fourth terror attack in the UK in four months, after incidents in Westminster, Manchester and on London Bridge.
Police said all the victims of the attack, which was in the area of Finsbury Park Mosque, were Muslim.