Britain's values will not be broken by "vile extremism", Theresa May said ahead of a memorial one year on from the Finsbury Park terror attack.
A minute's silence was held to commemorate the death of father-of-six Makram Ali, and for the dozen others who were injured on June 19 last year.
Relatives of Mr Ali gathered alongside others affected by Darren Osborne's murderous rampage, when he drove a hired van on to a crowded pavement, intending to kill as many Muslims as possible.
Home Secretary Sajid Javid, Mayor of London Sadiq Khan and Labour leader Jeremy Corbyn all attended the event at Islington Town Hall on Tuesday, where a silence was held at 9.30am.
Osborne named Mr Khan during his nine-day trial at Woolwich Crown Court as someone, alongside Labour leader Jeremy Corbyn, he had wanted to kill.
Islington councillors, local faith and community leaders, and emergency services workers who helped victims in the aftermath of the attack also attended Tuesday's commemorative event.
Ahead of the event, the Prime Minister said: "Last year's cowardly attack which targeted innocent worshippers leaving Finsbury Park mosque is an attack on all of us.
"As with all acts of terrorism the intention was to divide us but we will not let this happen.
"We are a country of many faiths and freedom of worship and respect for those of different faiths is fundamental to this country's values and these values will never be broken by vile extremism."
Mrs May commended the "bravery and spirit of the community that apprehended the attacker".
She added: "As we remember the victims of this attack, Makram Ali who tragically lost his life, we should take strength that it is London's diversity and multitude of communities that makes it one of the world's great cities."
Mr Corbyn said: "A year on from the tragic attack outside Muslim Welfare House London in Finsbury Park, when a man filled with hate drove into a crowd of people after prayers, we remember the life that was lost and those still suffering from the aftermath - and the inspiring response of our community.
"One man, Makram Ali, was killed and eight people were injured in this terrible attack that brought terror to our streets.
"But the response of our community - people of all faiths and none - was to come together in solidarity and strength.”