Footage taken by a passersby has revealed the sheer instinctive guts and determination of those who confronted Usman Khan in the moments after he carried out his murderous attack inside Fishmongers’ Hall.

Two men can be seen cornering the terrorist on London Bridge armed only with the nearest objects which came to hand - a five-foot antique Narwhal tusk and a fire extinguisher.

A third man uses just his bare fists to help force Khan onto the ground before he is shot and killed by armed officers who arrived on the scene within minutes of him launching the attack.

It is now thought the man who used the whale tusk as an impromptu weapon to corner Khan was a Polish-born chef who had been working at Fishmongers' Hall.

Colleagues and those attending a prisoner rehabilitation conference organised by the Institute of Criminology at Cambridge University told how, with barely a thought for his own safety, the chef, called Lukasz, grabbed the tusk from a wall from where it had been displayed inside the hall and attempted to defend others around him from Khan.