Saskia Jones, 23, was killed along with a fellow University of Cambridge graduate, 25-year-old Jack Merritt, whose death had already been reported by his family following the Friday attack, Metropolitan Police said Sunday in a news release.

Both victims worked for the Cambridge-based prisoner rehabilitation program Learning Together.

Usman Khan was wearing an electronic monitoring tag when he launched the attack, which injured three others, after he was invited to the prisoner rehabilitation conference on Friday.

Police have said that Khan appears to have been in compliance with the conditions governing his release, which were not made public, but nonetheless was able to carry out a deadly assault that did not rely on sophisticated weaponry or detonation of an explosive device.

One of those injured has been released from hospital while two are still receiving treatment.

She "had a wonderful sense of mischievous fun and was generous to the point of always wanting to see the best in all people", the family said in a statement provided to police.

Forensic officers attend the scene in central London, Saturday, Nov. 30, 2019, after an attack on London Bridge on Friday.

Her family said she was "intent on living life to the full" and had a "wonderful thirst for knowledge" which enabled her to be the "best she could be".

Metropolitan Police Assistant Commissioner Neil Basu said five people had been stabbed inside Fishmonger's Hall by London Bridge before members of the public pursued the attacker.

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"They are being properly invigilated to make sure there is no threat", Mr Johnson told the BBC.

"We've taken a lot of action as you can imagine in the last 48 hours".

Members of the public were hailed as heroes for preventing even greater loss of life by tackling Usman Khan - one armed with a 1.5-meter narwhal whale tusk and another with a fire extinguisher - before police shot him dead.

The force has said that there is just not the kind of thing as a files to recommend that the arrested man was as soon as desirous referring to the incident at London Bridge.

Conservative cuts to community policing, probation, mental health, youth and social services could "lead to missed chances to intervene in the lives of people who go on to commit inexcusable acts", said Corbyn.

But IS has released a statement claiming responsibility for the attack.

Khan was convicted as part of an Al-Qaeda-linked group accused of plotting to target major sites including Parliament and the US Embassy, as well as individuals, such as Prime Minister Boris Johnson, who was then London Mayor, the dean of St Paul's Cathedral in London and two rabbis.

But his sentence was quashed by the Court of Appeal in 2013 and he received a new 21-year term, comprising a custodial sentence of 16 years and five years on conditional release. He was released in December, 2018, (his time served took into account the period he spent in jail awaiting trial) and placed on a 13-year probation program that included wearing a Global Positioning System ankle bracelet and regular monitoring by police.

He was keen to portray his rival for prime minister, Labour leader Jeremy Corbyn, as being weak on crime, blaming the opposition party for bringing in a law that automatically released some prisoners early when it was in government. The Prime Minister has vowed to introduce a host of reforms including mandatory minimum 14-year sentences and an end to automatic early release for people convicted of terrorism offences.