Mohammed Kozbar, the chairman of Finsbury Park Mosque in north London, said members of Islington's differing faith communities had come together as part of the weekend's Great Get Together, a year on from the politician's murder.
"He tried to kill a lot of people so obviously it's a militant attack".
Its former imam, Abu Hamza, was jailed for life in NY on terrorism charges in 2015.
The van struck a crowd of worshippers leaving a mosque early Monday morning, killing one person and injuring several others.
"We pushed people away from him until he was safely taken by police".
The chairman of the Finsbury Park Mosque, Mohammed Kozbar, has complained that the "mainstream media" was unwilling to call the attack a terrorist incident for many hours. "And we will stop at nothing to defeat it".
"All the victims were from the Muslim community and we will be deploying extra police patrols to reassure the public, especially those observing Ramadan".
I'm totally shocked at the incident at Finsbury Park tonight.
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The attack outside the Muslim Welfare House comes on the heels of two recent attacks in London in which vehicles have also been used as weapons, both on bridges over the Thames River.
The State Department says the US and the United Kingdom remain committed to fighting "the plague of terrorism".
A 47-year-old father of four, Darren Osborne, was named in the British press as the man arrested on suspicion of ploughing a van on Monday into a group of Muslims in London.
Witnesses said they saw people at the scene grab the man, pulling him from the van and started hitting him.
Local youths told by Middle East Eye they were forced to restrain the alleged attacker themselves for between 10 and 20 minutes. A witness told Sky News that two other people fled the scene of the attack, but police said there were no other suspects at present.
May said police would assess security at mosques and provide any additional resources needed ahead of upcoming celebrations marking the end of Ramadan.
Britain's terror alert level is at "severe", meaning security officials believe an attack is highly likely.