Police are appealing for witnesses after a collision was reported.
A man was taken to hospital with serious injuries after officers were called to reports that a motorbike had collided with a tree.
It's understood the collision happened in an alleyway off Mansfield Road, Daybrook, at around 2am on Saturday 16 September 2023.
Inquiries are ongoing to establish the circumstances around the incident, including checking CCTV footage in the area.
Collision investigator DC Liah Lane, of Nottinghamshire Police, said: “We are urging anyone who saw the collision, or who was in the area in the moments leading up to the crash, to please get in touch with us.
“We’d particularly like to hear from anyone with dashcam or CCTV footage which could help our investigation and we are very keen to speak with the person who called the East Midlands Ambulance Service following the crash.
Anyone with any information is urged to call Nottinghamshire Police on 101, quoting incident number 68 of 16 September 2023, or Crimestoppers anonymously on 0800 555 111."