A man was knocked unconscious in an attack in Sheffield city centre after an argument developed into a fight.
South Yorkshire Police said two men were involved in an argument outside Cubana Tapas Bar in Leopold Square at 2.35am on Saturday, November 17 and a short time later started fighting in Leopold Street.
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One of the men was knocked unconscious and he has since lost some vision in one of his eyes.
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Officers have released a CCTV image of a man they believe could hold vital information about the incident.
Anyone with information should call South Yorkshire Police on 101 and quote crime reference number 14/169871/18.