Police are investigating a spate of car fires in Mandurah and Kwinana overnight.
Two cars were deliberately set on fire between 11pm and 11.30pm in Mandurah.
A Holden Rodeo ute parked in the carpark of a hotel on Dolphin Drive was the first car set on fire.
The second car, a Holden Rodeo Ute in the carpark of a unit complex on Ormsby Terrace, was also set on fire and destroyed.
About 4.15am, police and emergency services were called to a car fire on Casuarina Road in Casuarina.
A car, reportedly a Holden or Ford ute, was completely destroyed.
About 4.50am, a Ford ute in a carpark adjacent to a Cafe on Butcher Street, Kwinana was reported on fire.
Police are investigating if the vehicle was used in an attempted ram raid on the building before catching fire.