The UK paid tribute to victims of Friday's terror attack in London as politicians, friends and family gathered with members of the public in the British capital and Cambridge on Monday.

Jack Merritt, 25 and Saskia Jones, 23 were stabbed to death in a knife attack by a convicted terrorist on Friday. Three others were injured.

Usman Khan was shot dead by armed police after he was tackled to the ground by bystanders at the north end of London Bridge.

Prime Minister Boris Johnson, opposition Labour leader Jeremy Corbyn and the Mayor of London, Sadiq Khan observed a minute's silence while they attended a vigil at Guildhall Yard in central London.

Tributes were also paid to the injured, emergency services and members of the public who fought the attacker.

In his address Sadiq Khan said that London would never be intimated by terrorism.

"The best way to defeat this hatred is not by turning on one another, but it's by focusing on the values that bind us, to take hope from the heroism of ordinary Londoners and our emergency services who ran towards danger, risking their lives to help people they didn't even know."

He added: "Our thoughts and prayers are with the families of Jack Merritt and Saskia Jones and all those injured."

A memorial service in honor of the victims was also held at the center of Cambridge.

Jack Merritt and Saskia Jones, both Cambridge University graduates, were participating in a conference organized by the university on prisoner rehabilitation at the Fishmongers' Hall in London, when the attack started.

Usman Khan was wearing an electronic tag as he went on a stabbing rampage at the conference venue. He was released from prison in December 2018 on license.

In 2012 the 28-year-old was part of a group convicted of planning attacks on major sites, including the London Stock Exchange, the US embassy and home of Boris Johnson, who was then the Mayor of London.