Firefighters are working to contain an out-of-control bushfire in the Great Southern.
The fire started yesterday in Mt Roe National Park near Powley Road.
It is being treated as suspicious.
Flames are now burning in 10m-high trees and the fire is moving 800m/h.
The Department of Fire and Emergency Services has issued a watch and act alert for residents east of Clear Hills Road, south of Muir Highway and west of Denbarker and Springs roads.
Seventy firefighters and 18 trucks are at the scene.
Significant smoke is expected to affect the western part of the Shire of Plantagenet today and motorists are being asked to avoid the area.
Anyone with information about the cause of the fire should call Crime Stoppers on 1800 333 000.