MANDURAH Detectives are seeking information to assist their investigation into a serious assault in Secret Harbour on Friday, February 24.
A 21-year-old man was with friends at a bar on Oasis Drive Secret Harbour.
Sometime between 11pm and 11.25pm the victim went outside and was standing on the pathway at the front of the bar when he became involved in a physical altercation with a man not known to him.
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During the altercation the victim was punched, causing him to fall backwards and hit his head on the pavement.
He received serious head injuries as was taken by ambulance to Royal Perth Hospital.
It is believed several people were in the vicinity around the time of the incident and detectives would like to speak to anyone who saw it.
Anyone with any information can call Crime Stoppers on 1800 333 000, or report the information online.