A 17-year-old boy had to go to hospital for treatment following an attack at a York club.
Police have isssued these CCTV images of a man they want to speak to in connection with the incident.
A North Yorkshire Police spokeswoman said:
The victim was taken to hospital by ambulance for treatment of a suspected detached retina and multiple abrasions.
Officers are asking members of the public to get in touch if they recognise the man in the CCTV images as they believe that they may have information that will help the investigation.
If you can help contact the police on the numbers below.