A fire that damaged two vehicles and a carport in Quinns Rocks this morning is believed to have been deliberately lit.
The fire started at a home in Meadow Place about 5.10am.
Police said a trail of burnt material was found leading towards a nearby park.
Those with information are asked to contact Crime Stoppers on 1800 333 000.
A fire at a commercial building on Kent Street in Rockingham about 2am has been deemed non-suspicious.