Police are searching for a man they say punched a member of the public through a car window in Mandurah on Thursday afternoon.
The victim was allegedly driving along Mandurah Terrace about 4pm when he overtook another vehicle and then parked at the IGA car park in Silversands.
Police say the male driver of the vehicle that was overtaken followed the victim, before exiting the car.
He allegedly assaulted the victim by punching him through an open window.
The victim received minor injuries as a result of the incident.
Anyone with information is asked to contact Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.
The incident number to quote for anyone with information is 300818 1700 15821.