09:33 EDT, 21 April 2021 Advertisement Two hero members of the public told how they fearlessly tackled London Bridge terror attacker Usman Khan with a fire extinguisher and a narwhal tusk - before ordering armed police to 'shoot the b******', an inquest heard. Convicted terrorist Khan, 28, was armed with two knives and wore a fake suicide vest as he stabbed Saskia Jones, 23, and Jack Merritt, 25, to death and injured three others at a prisoner rehabilitation event near London Bridge on November 29, 2019. Two men who formed part of a trio who bravely rushed outside to confront crazed Khan as he sought to continue his rampage today relived their ordeal at an inquest at Guildhall in the City of London.