Prime Minister Theresa May says the terror attack near a north London mosque is “every bit as sickening” as 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.
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.
Police said all the victims of the attack, which was in the area of Finsbury Park Mosque, were Muslim.
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Mrs May was speaking after chairing a meeting of the government’s emergency Cobra committee.
She said the driver of the van acted alone, adding: “Hatred and evil of this kind will never succeed.”
She also said that police declared it a terrorist incident within eight minutes, and that it was “an attack on Muslims near their place of worship”.
Mrs May added that “there has been far too much tolerance of extremism over many years”.
“It is a reminder that terrorism, extremism and hatred take many forms; and our determination to tackle them must be the same whoever is responsible.”