A 34-year-old man is in a critical condition in hospital after he was stabbed in Norwich.
The victim, who was attacked in Barnard's Yard on Wednesday night, is thought to have been stabbed in the leg, Norfolk Police said.
He was taken to the Norfolk and Norwich University Hospital where his condition is described as critical.
Four men arrested in connection with the stabbing are being questioned by detectives.
Anyone with information about the incident, which took place at 2150 GMT, is asked to contact Norfolk Police.
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