Officers have a scene in place following reports of a knife incident outside Pryzm night in Nottingham city centre.
The incident happened around 4am on 4 December 2019 on Lower Parliament Street.
A 21-year-old man was stabbed and he has been taken to hospital for treatment. His injuries are serious, but not believed to be lift threatening.
Officers remain at the scene whilst investigations continue.
Parts of Lower Parliament Street (near to King Edwards Street) next to the nightclub are currently closed, which may affect traffic this morning
No arrests have been made at this time and enquiries are ongoing.
Officers are appealing for anyone who saw the incident or has any information which could help the investigation, to ring 101 and quote incident number 67 of 4 December 2019.