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A man who was inside Fishmongers' Hall when a knife-wielding terrorist started stabbing members of the public grabbed a five foot narwhal tusk to try and fight him off.

The unnamed hero took the tusk from the wall inside the Grade II-listed building which is close to London Bridge.

He can be seen in footage from the bridge using the tusk from the sea creature as a kind-of walking stick.

Amy Coop wrote on Twitter : "A guy who was with us at Fishmongers Hall took a 5’ narwhal tusk from the wall and went out to confront the attacker. You can see him standing over the man (with what looks like a white pole) in the video.

"We were trying to help victims inside but that man’s a hero".

Members of the public bravely tackled the terrorist who had stabbed two people to death before stepping onto London Bridge.

Metropolitan Police Commissioner Cressida Dick confirmed two people died, and three others were injured.

She refused to confirm whether or not the suspect was known to police, but said: "We will be working as fast as we can to understand who this man is, where he comes from and whether there is anyone else who we need to find quickly who might be in touch with him."

(Image: Twitter)

NHS England confirmed one of the three injured victims was "critical but stable" while another is stable. The third victim has less serious injuries.

Prime Minister Boris Johnson praised members of the public "for their immense bravery" after it emerged bystanders helped tackle the suspect to the ground and disarm him.

Mr Johnson, called a meeting of the Government's emergency committee Cobra on Friday evening and cancelled his General Election campaigning events on Saturday. The Lib Dems have also decided to temporarily suspend campaigning.

(Image: Getty Images)

Several people were stabbed by the knifeman before he was stopped in his tracks on London Bridge, which was the scene of the bloody massacre in summer 2017 where eight people were killed and 48 seriously injured.

Scotland Yard said the incident started at nearby Fishmongers' Hall, and that police had "bravely and professionally confronted the suspect" within five minutes of being called.

Footage on social media showed one man being urged to move away by armed officers before the suspect was shot at point-blank range, as another bystander - understood to be a plain clothes officer - could be seen carrying a large knife from the scene.

Another video appeared to show a person on a stretcher, surrounded by emergency services staff and vehicles, being given CPR by responders following the attack.

The members of the public who intervened have been widely praised, with mayor of London Sadiq Khan hailing their "breathtaking heroism".

Witnesses said the suspect appeared to be wearing a suicide vest but Neil Basu, the head of UK counter-terrorism policing, said the vest was a fake.

He said police were called at around 2pm on Friday to a stabbing "at a premises near London Bridge".

After being shot, the suspect in Friday's attack raised his arms towards his head before lying still. A second knife could be seen on the ground near his body.