FILE - In this Monday, Dec. 2, 2019 file photo, tributes are placed by the southern end of London Bridge, three days after a man stabbed two people to death and injured three others before being shot dead by police, in London. A mysterious figure who used a rare narwhal tusk to help subdue a knife-wielding extremist on London Bridge last month has been identified as a civil servant in Britain's Justice Ministry. Darryn Frost ended his silence Saturday, Dec. 21 telling Britain's Press Association that he and others reacted instinctively when Usman Khan started stabbing people at a prison rehabilitation program at a hall next to the bridge on Nov. 29.(AP Photo/Matt Dunham, file)
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