Perth Detectives are seeking witnesses to an assault in the Perth CBD in early June which left a man with a fractured skull.
A woman was also assaulted in the same incident, which happened in Murray Street on Sunday, June 4.
Police say the 22-year-old male victim was with the 20-year-old woman when he was approached by a group of men near Pier Street.
The victim was assaulted, before he fell to the ground and hit his head.
He was knocked unconscious and received a fractured skull. The woman was also assaulted.
Police say the men pictured may be able to assist with the investigation.
Anyone who recognises them is asked to call Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au