UDPATE 2:30pm: FESA have issued an ALL CLEAR for the fire burning in the City of Rockingham.
Firefighters are currently mopping up and will leave the area safe, and monitor the area for the rest of the day.
People in the area are urged to remain vigilant when driving through smoke.
The blaze started between Memorial Drive and Lease Road and was reported at 5.30am today.
Both roads remain closed.
Residents are being urged to be alert and monitor their surroundings, close all windows and doors and turn off evaporative air conditioners.
A DEC statement said the cause of the fire was suspicious.
A fixed-wing water bomber assisted 20 fire fighters at the fire scene.