A man in his fifties has been taken to hospital after he was hit by a bus outside the Victoria Centre.
It happened at around 3.50pm close to the junction of Milton Street and Lower Parliament Street.
Passers-by said they saw the man lying in the road being treated by paramedics after being hit by a single-decker NCT bus.
Police also attended the scene and the road was briefly blocked while the man was treated and moved to a waiting ambulance.
NCT is warning passengers travelling through the city centre to expect delays.
Picture: Emergency crews outside the Victoria Centre
A Notts Police spokesman said the man’s condition is not yet known, and added no arrests have been made.
A spokesman for NCT said: “A Nottingham City Transport Blue Line 39 bus has been involved in an incident on Parliament Street and the road was briefly closed.
“Until we determine the exact details of what took place, it would be inappropriate to comment further at this stage.”