A 21-year-old man who was stabbed in the early hours of Sunday morning in Nottingham remains in a critical condition in hospital.
The man was found near the Primark store in Long Row with a puncture wound to his body at around 1:45am yesterday.
An extensive search of the area has taken place and detectives are viewing hours of CCTV footage covering the city centre.
Detective Inspector Leigh Sanders, said: "We believe the altercation took place near to where, and not long before, the victim was found.
"It is possible that there were a number of people involved."
Nottinghamshire Police are appealing for witnesses and information in relation to the assault.
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Remaining very windy with gales. Rain soon clearing, with sunny intervals developing.
Outbreaks of rain, sometimes heavy, will soon clear. Sunshine and scattered showers will follow. Mainly dry later.
Localised gales will develop across parts of the region tonight. Tomorrow there will be sunshine and scattered showers.