LONDON, ENGLAND - DECEMBER 02: (L-R) Prime Minister, Boris Johnson and Labour Leader, Jeremy Corbyn attend a vigil for victims Jack Merritt, 25, and Saskia Jones, 23 of the London Bridge attack and to honour the public and emergency services who responded to the incident at the Guildhall Yard on December 2, 2019 in London England. Usman Khan, a 28 year old former prisoner convicted of terrorism offences, killed two people in Fishmongers' Hall at the North end of London Bridge on Friday, November 29, before continuing his attack on the bridge. Mr Khan was restrained and disarmed by members of the public before being shot by armed police. (Photo by Leon Neal/Getty Images)