World leaders unanimously condemned the attack in the heart of London by a man who was shot dead by armed police, with many saying they stand with Britain.
At least five people were killed and more than 40 injured in the attack outside parliament Wednesday when a man mowed down pedestrians with a car then leapt out and stabbed a police officer.
In an address outside her Downing Street office, Prime Minister Theresa May described the attack as "sick and depraved" saying the assailant chose the site as an assault on Britain's democratic values.
Chancellor Angela Merkel said Germany stood "firmly and resolutely alongside Britons in the struggle against all forms of terrorism" while President Frank-Walter Steinmeier added: "In these grave moments, we Germans feel very close to the British people."
President Francois Hollande sent a message of "solidarity" and "support to the British people" saying France could identify with their pain after the attack, in which three French high school students were also wounded.
"France, which has been hit so hard in recent times, knows what the British people are suffering today," he said.
And Prime Minister Bernard Cazeneuve tweeted: "Solidarity with our British friends, horribly attacked, full support for the injured French students, their families and their friends."
India PM Narendra Modi said that India "stands with (the) UK in the fight against terrorism." Modi said his thoughts are with the families of the killed and the wounded.