Three people were cut from their vehicle on Monday after the car hit a tree in Baldivis, leaving two passengers with serious injuries.
The accident happened about 7.15pm, when a 45-year-old driver lost control of his Mitsubishi Lancer while travelling east on Safety Bay Road, police spokeswoman Susan Usher said.
The vehicle crossed the median strip and hit a tree, trapping the driver and two passengers in the car.
Department of Fire and Emergency Services officers cut the trio free, with St John Ambulance transporting a 67-year-old woman and one other passenger with serious injuries to hospital.
The driver received minor injuries and was also taken to hospital.
Police would like to speak to anyone who saw the crash or saw the vehicle prior to the crash and anyone with information should call Crime Stoppers on 1800 333 000.
