A peacemaker was stabbed and beaten with a glass tube after he tried to break up a fight.
Detectives are hunting two suspects after the 23-year-old victim was left with a broken rib and a laceration to his lung.
The man had tried to diffuse an argument between two men and a group of other people on September 23.
After an exchange of words, he was chased by the pair into a newsagent in King’s Cross, central London.
One man hit him with a glass tube, while another stabbed him in the torso during the 5.30am attack.
Shocking footage shows the moment he is chased into the shop and viciously assaulted.
The victim was taken to an east London hospital where he was treated for a broken rib and a laceration to his lung.
He has since been discharged and is still recovering from his injuries.
Scotland Yard has released images of two suspects in a bid to trace them.
Detective Constable Joe Marston, of the Met’s Central North CID, said: “The victim sustained serious injuries in what was a needless and incredibly violent attack.
“We would urge anyone who recognises these men to contact police as soon as possible.”
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