"Muslim communities have been calling for increased action to tackle the growth in hate crime for many years and transformative action must now be taken to tackle not only this incident but the hugely worrying growth in Islamophobia", he said.
Counter-terrorism officials said the driver targeted people who were assisting a man who had collapsed outside the mosque, who later died at the scene, adding that "any causative link between his death and the attack will form part of our investigation".
Meanwhile, delivery driver Mohammad Abdullah, who was on his bike near the incident, told Sky News he saw the van "take a sudden left turn".
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The incident took place during the Muslim holy month of Ramadan, when worshipers traditionally fast during the daytime and worship at night.
"Horrible to watch police officers doing cardiac massage at people on the floor, desperately trying to save them".
"Officers are on scene with other emergency services".
"We are working closely with other members of the emergency services at the scene". It said its prayers are with the victims. "I've been in touch with the mosques, police and Islington council regarding the incident", Corbyn wrote.
London Mayor Sadiq Khan, the first Muslim to serve in that position, said extra police would be deployed. The attack killed five people.
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Officers have confirmed the van struck a number of people leaving Ramadan prayers.
London police say one suspect has been detained in an apparent early-morning attack on worshippers standing outside a mosque. He has been taken to hospital as a precaution and will be taken into custody once discharged, police said.
A 48-year-old-man has been arrested at the scene near the Muslim Welfare Centre in Finsbury Park.
Britain's terrorist alert level is now at "severe" meaning an attack is highly likely.
Shortly after midnight a van drove into a crowd of worshippers coming out of evening prayers at a mosque in Finsbury Park in North East London.
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