Police are looking for a group of men who they believe witnessed a serious assault near to a Lincoln city centre nightclub.
Police were called to Silver Street, at 3.14am on Sunday, June 10 after an incident in which a man received a head injury outside Moka nightclub.
The 40-year-old victim has since been discharged from hospital following treatment.
A 31-year-old man has been arrested and released under investigation.
Lincolnshire Police said in a statement: “Officers investigating have today released images of four men who may have witnessed the incident.
“It is important to clarify that these men are not suspects but may have seen or heard something that could help with the investigation.”
If you have information, here’s how you can get in touch:
Anyone who saw what happened or has information about the incident can call police on 101.