The London Bridge killer has been named as Usman Khan, a convicted terrorist who had been a member of an al Qaida-inspired group.
The 28-year-old killed a man and a woman, and injured three other people in a knife rampage before being shot dead by police on Friday.
He had been living in Stafford after being released from prison on licence in December 2018.
Khan was charged with conspiracy to cause explosions and other terrorism offences in late December 2010, along with eight others.
On February 1 2012, the nine pleaded guilty to various terrorist offences, with four admitting an al Qaida-inspired plot to detonate a bomb at the London Stock Exchange.
Woolwich Crown Court heard a hand-written target list found on a desk at one of the plotters' homes also included the names and addresses of the Dean of St Paul's Cathedral in London, then London mayor Boris Johnson, two rabbis, and the American Embassy in London.
Khan was sentenced to 16 years behind bars but was released in under seven.
Former head of the UK National Counter Terrorism Security Office Chris Phillips warned that the criminal justice system was playing “Russian roulette” with the public.
Security Minister Brandon Lewis has insisted the government would move “very swiftly” in its review of sentencing for violent crimes.
The attack began at Fishmongers’ Hall in the City of London at around 2pm on Friday November 29.
The Metropolitan Police Commissioner Cressida Dick said officers were called at 1.58pm and had confronted Khan on London Bridge by 2.03pm.
She said: “I am deeply saddened and angered that our city of London has again been targeted by terrorism.”
It has also emerged that one of the people who helped tackle Khan was James Ford, who was jailed in 2004 for the motiveless murder in Kent of 21-year-old Amanda Ford, who had the mental age of a 15-year-old.
Ford, who was jailed for life with a minimum term of 15 years, had been invited to the Fishmongers’ Hall on day release along with Khan, students, staff members, alumni and representatives from the Ministry of Justice.
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