The incident took place in April.
Police investigating an assault in which a man suffered head injuries have released images of two males they would like to identify.
It is believed to have happened outside Club Candy in Sackville Street, Bradford in the early hours of Monday, 15 April.
The victim, a man in his twenties, was taken to hospital and later discharged after receiving treatment for his injuries.
Detective Inspector Mark Taylor, of Bradford District CID, said: “We have made extensive enquiries to identify these males who were both seen in the area at around the time of the attack.
“We are keen to speak to them as we believe they may have information to assist with our investigation.”
Anyone who recognises these males is asked to contact Bradford District CID on 101, quoting crime reference 13190193742, or report online at www.westyorkshire.police.uk/101livechat.
Information can also be reported anonymously to the independent charity Crimestoppers on 0800 555111.