A 48-year-old man is in a critical condition in hospital after an attack in Shoalwater last night.
Police are calling for help with their investigation into the assault, which happened on Safety Bay Road, near Coventry Road.
St John Ambulance and police were called to the scene to respond to a man with serious injuries just before 11pm.
A police spokesman said it appeared the man had been assaulted and he was taken to Rockingham Hospital.
He was later moved to Royal Perth Hospital, where he remains in a critical but stable condition.
Forensic officers attended the scene last night and Rockingham detectives are investigating.
Anyone with information on the incident is asked to contact Crime Stoppers on 1800 333 000.