Police are investigating a fire at a home in South Bunbury.
It is believed offenders broke into the garage of the home on Jarvis Street and set fire to a Mazda CX3 around 1.40am on Tuesday.
The fire damaged the car, the garage and other items in the garage.
The damage bill has been estimated at $120,000.
Detectives urge anyone with information, or who has dash-cam vision of Jarvis Street between 1am and 2.30am, to call Crime Stoppers on 1800 333 000 or report the information online at www.crimestopperswa.com.au.
Rewards of up to $50,000 are available for information that leads to the identification and conviction of an arsonist.