A man remains in an induced coma after being found unconscious in Mandurah.
Police believe an incident occurred on Christmas Day between 6.40pm and 7.10pm on Mandurah Road between Pinjarra Road and Leslie Street.
The man was taken to hospital by ambulance where he remains in an induced coma.
Police are appealing to witnesses and anyone who may have been in the area at the time with vehicle dash-camera or mobile phone footage.
If you have any information that can assist, please contact Mandurah Detectives Office on 9531 8888 or Crime Stoppers on 1800 333 000.