After meeting faith leaders at Finsbury Park Mosque, she said: "The awful terrorist attack which took place last night was an evil borne out of hatred and it has devastated a community".
Ten people were injured and police said a man died at the scene, though he was receiving first aid at the time and it wasn't clear if he died as a result of the attack or something else.
The London police are also investigating whether the person who died was actually killed in the attack.
"The driver jumped out and then he was pinned down to the floor and people were punching him and beating him, which was reasonable because of what he's done", he said. After the Westminster attack in March it took police just over two hours to do so. "Their restraint in the circumstances was commendable".
Cleveland Police bosses are calling for vigilance in the wake of the latest terror attack in London.
The use of a vehicle to mow down pedestrians drew horrifying parallels with this month's London Bridge attack, when three men drove a van into pedestrians before embarking on a stabbing spree, and with another auto and knife rampage near parliament in March.
"He tried to kill a lot of people so obviously it's a terrorist attack".
The Muslim Council of Britain tweeted, "We have been informed that a van has run over worshipers as they left #FinsburyPark Mosque".
The week after the Manchester attack, which was claimed by Isis, verified reports of Islamophobic hate crimes increased more than fivefold, according to the organisation Tell Mama, which monitors anti-Muslim hatred in Britain. Mohammed Kozbar, chairman of the Finsbury Park Mosque, described the attack as "cowardly". "I would urge everyone to remain calm and vigilant", Basu said.
British Prime Minister Theresa May departs 10 Downing Street, central London on Monday ahead of delivering a statement on the Finsbury Park Mosque attack.
Details about the assailant were sketchy, but the assault - the most dramatic against Muslims in London in recent years - suggested a new, unsafe level of polarization in British society.
Two weeks earlier, a suicide bomber killed 22 people at a concert by American pop singer Ariana Grande in Manchester in northern England.
Witness Hussain Ali, 28, told the Press Association that "the leader of the mosque said "You do not touch him".
Abu Hamza, who was the mosque's imam from 1997 to 2003, was later extradited to the United States, where he was convicted of supporting al Qaeda and Taliban terrorists, and sentenced to life in prison in 2015. The Finsbury Park Mosque, which was rendered notorious during the 1990s by the preaching of extremist Abu Hamza, has worked hard to divorce itself from the extremism of the past.
Some locals came onto the street in support of the mosque on Monday, carrying signs saying "We love our mixed community" and "Leave our Muslim neighbors alone".
Amid the chaos and agitation surging through a crowd early Monday after a van plowed into pedestrians outside London's Finsbury Park Mosque, one person stepped in to protect the attacker, witnesses say: the mosque's imam.