Labour and the Conservatives sought to blame each other for the release of the convicted terrorist who killed two people in London Bridge on Friday.
Prime minister Boris Johnson and home secretary Priti Patel both claimed that Jeremy Corbyn’s party was responsible for the law that meant 28-year-old Usman Khan was freed on licence half way through his 16-year sentence.
Meanwhile former shadow home secretary Yvette Cooper questioned what action the government took to assess the risks posed by the attacker, and both Labour leader Jeremy Corbyn and Sadiq Khan, the mayor of London, pointed to cuts made to public services over the last decade.
The attacker, who was convicted of terrorism offences in 2012 and released last December, was fatally shot by police at about 2pm on Friday.
One of the victims has been named as 25-year-old Jack Merritt, who worked as a course coordinator for the prisoners’ rehabilitation programme holding the event at Fishmongers’ Hall.
His father David described him as “an exceptional young man” and called for greater funding of probation services monitoring released prisoners.
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Speaking on Saturday morning, Mr Khan said: “The key thing is we need to support the police and security service.
Professor Stephen J Toope, the vice chancellor, said he was “devastated” to learn the attack may have been targeting people attending an event organised by the university.
Mr Lewis, who spoke to Sky News and the BBC on Saturday morning, also responded to suggestions that cuts played a role in the attack.
In a new statement, police have asked members of the public to be vigilant and said it is vitally important that people remain “alert but not alarmed” after the attack.
“The criminal justice system needs to look at itself,” he told the Press Association.
Two people were killed in the stabbing attack on Friday and three others injured.
Boris Johnson said he would be chairing an emergency Cobra meeting and there would be an enhanced police presence on the streets for “reassurance purposes”.
Jeremy Corbyn said he was “deeply shocked” by the attack and thanked police officers and members of the public who intervened.
And Jo Swinson said her thoughts were with all those affected by “this appalling display of violence”.
Mr Khan commended the bravery of members of the public and said he did not think it was right for someone convicted of a serious offence to be automatically released.
Officers are particularly interested in speaking to anyone who was at Fishmongers' Hall on London Bridge yesterday.
And according to historian Guy Walters, he is not the first person to think of taking a narwhal tusk as a weapon.
In Greenland, the tusks used to be made into a weapon called a “nuguit”.

“Prince Philip and I have been saddened to hear of the terror attacks at London Bridge.
“We send our thoughts, prayers and deepest sympathies to all those who have lost loved ones and who have been affected by yesterday's terrible violence.
“I express my enduring thanks to the police and emergency services, as well as the brave individuals who put their own lives at risk to selflessly help and protect others.”
The prime minister was joined by Priti Patel and Cressida Dick on the bridge.

