Residents in Rockingham and the eastern part of Hillman are being warned to prepare for a fire that is threatening lives and homes.
The Department of Fire and Emergency Services has issued a bushfire watch and act warning for people in the area bounded by Dixon Road, Day Road and Mandurah Road.
In a statement this morning, the department warned residents they should leave their homes or get ready to actively defend them.
The blaze has caused the closure of Dixon Road between Day Road and Mandurah Road and Day Road between Dixon Road and Mandurah Road.
Motorists are being advised to avoid the area.
The blaze was reported about 10.30am and fire crews and aerial support are on the scene.
The cause of the fire is not yet known.