Two men are being hunted over an attack outside a Sheffield nightclub.
South Yorkshire Police said two men suffered facial injuries in an attack by two other men near Code nightclub, Eyre Street, in the city centre, on Friday, March 31.
The victims were waiting for a taxi when they were assaulted.
Their attackers have not yet been traced but detectives have now issued two CCTV images of men they believe could hold vital information.
A police spokesman said: "Despite extensive enquiries, the suspects have not been identified and officers are now asking those pictured, or anyone who recognises them, to get in touch.
"It is believed they could hold vital information that could help with the investigation.
"Do you recognise those pictured? Do you hold information about the assault?"
Call South Yorkshire Police on 101 or Crimestoppers on 0800 555111.