The family of Jack Merritt, who was killed by London Bridge terrorist Usman Khan, are suing the Government over his death. Mr Merritt, 25, and Saskia Jones, 23, were fatally stabbed by Khan during a prisoner rehabilitation event at Fishmongers' Hall on November 29 last year.
Khan, 28, was out on licence when he attended the event, organised by Cambridge University's Learning Together programme, armed with two kitchen knives and wearing a fake suicide vest.
He was tackled by members of the public armed with a narwhal tusk, a decorative pike and a fire extinguisher before he was shot dead by police on London Bridge.
Mr Merritt's parents, Anne and David, his brother Joe and his girlfriend Leanne O'Brien are now taking legal action against the
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