Amazing story of bravery by citizens who happened to witness the attack.
One man was armed with a fire extinguisher and another a 5ft narwhal tusk as people at the scene surrounded the attacker, who was eventually pinned to the ground.
Scotland Yard is investigating how 28-year-old Usman Khan was able to launch the attack in London Bridge, despite being known to the authorities and fitted with an electronic tag to monitor his movements. He was allowed out a year ago after serving time for his part in a plot to blow up the London Stock Exchange.
In footage that has since emerged, Khan is sprayed with a fire extinguisher, while another man tries to suppress the assailant with a narwhal tusk – a long pointed tooth from a type of whale – lunging at him. It is believed the item was pulled from the wall of Fishmongers’ Hall, a Grade II-listed building on London Bridge, by a Polish chef called Łukasz.