On 29th November 2019 the Learning Together programme of the Cambridge University Institute of Criminology organised a celebration of their 5th anniversary to be held at the Fishmonger’s’ Hall in the City of London. The programme is intended to bring serving prisoners and undergraduates together in a learning environment. On this occasion one of the invitees was Usman Khan, who had been released from prison some 11 months previously after serving 8 years of a sentence imposed for terrorist offences.
It transpired that Khan had travelled to the event having equipped himself with knives and an imitation suicide belt. He attacked and killed Jack Merritt and Saskia Jones, both of whom were working with the Learning Together programme. Khan was subsequently killed by armed police officers
https://www.theguardian.com/uk-news/2021/jun/10/fishmongers-hall-terrorist-usman-khan-lawfully-killed-inquest-jury-finds