A suspicious bushfire that has covered southern parts of Western Australia, including Perth, with smoke, remains a threat to life and property.
The blaze began at 4pm (WST) on Friday in bushland in Mount Roe National Park, about 30 kilometres northwest of Denmark in the Great Southern region.
The cause of the fire is "suspected deliberate lighting".
Firefighters worked from Sunday night to Monday morning to consolidate and strengthen containment lines around the fire.
A watch and act alert remains in place for people in the western part of the Shire of Plantagenet, east of Clear Hills Road, south of Muir Highway and west of Pile and Springs roads.
"There remains a possible threat to lives and homes, as a fire in the area is still burning and conditions are changing," the Department of Parks and Wildlife said.
The bushfire is moving at a moderate speed in a northwesterly direction and has burnt through 13,300 hectares.
About 100 firefighters are using 36 appliances and six heavy machines to bring it under control.
Smoke alerts have also been issued for areas from Walpole to Geraldton and inland to Toodyay and Mount Barker, but the smoke is expected to clear later on Monday.
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