The Department of Fire and Emergency Services believe two bushfires in the South West overnight were deliberately lit.
The fires in Yallingup and Injidup both started just before 6.30pm on Saturday.
Both blazes reached an emergency warning with nearby residents urged to leave their homes.
Luckily, significant rainfall helped fire crews bring the blazes under control.
Bushfire advices remain in place.
Anyone with information, CCTV or dash cam footage should contact Crime Stoppers on 1800 333 000.
LISTEN: WA Police release triple-0 call from shooting murder of bikie boss Nick Martin at Kwinana Motorplex
Police pursuit comes to crashing end in East Rockingham
Tensions boil over in Rockingham council chambers as motion to reinstate weekly red bin collections is defeated
WA's first public National War & Service Animal Day commemoration to be held at Dawesville War Memorial
New road safety laws to be named in memory of Furnissdale hit-and-run victim
UK nuclear submarine docks at Rockingham's HMAS Stirling
Rockingham Police ask for public's help to find copper cable thieves
Woman dies in Bunbury motorcycle crash
International chef Diana Chan announced as Mandurah Crab Fest culinary ambassador