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A clubber was allegedly bottled after trying to break up an argument in Herne Bay town centre.
Police are appealing for information following the incident, which left the victim with severe injuries to his hands.
It happened between 1.30am and 2am on Saturday, as the 19-year-old man left a nightclub in the town with a friend.
As he was leaving, he saw a man and a woman embroiled in an argument.
The victim attempted to intervene, at which point it is alleged he was hit with a bottle.
The man suffered severe injuries to his hands and will require on-going treatment at East Grinstead hospital.
DC Natalie Davison said: "This was a violent assault on a man who was concerned about a domestic dispute in the High Street.
"As a result of his interaction he will now have to endure a long recovery process. I would urge anyone with information to contact us."
Anyone with information is asked to call 01843 222289 quoting reference ZY/020348/16 or CrimeStoppers anonymously on 0800 555111.