Update: A bushfire is posing a possible threat to lives and homes in the South West and residents have been warned to prepare or leave their properties.
About 50 firefighters from the Bush Fire Service and Parks and Wildlife Service are battling the blaze in Wandillup and Maranup which has already burnt about 80ha of land.
At this stage, it is unknown what sparked the fire which started at 12.54am near the intersection of Brockman Highway and Marnup Ford Road in the Shire of Bridgetown Greenbushes.
The Department of Fire and Emergency Services has issued a Watch and Act alert for the area bounded by Brockman Highway, Allnut Road, Brown Road, Five Gates Road and Maranup Ford Road.
Residents who are not bushfire ready have been advised to leave now if the way is clear. Those who choose to stay should make final fire preparations to actively defend their home.
People with properties in the area who are not at home are advised not to return as conditions could be dangerous.
Maranup Ford Road between Maranup Ford Caravan Park down to Maranup Ford Road and Brockman Highway intersection is closed. Brockman Highway has reopened with reduced speed.
A bushfire advice is in place for people in areas bounded by Brockman Highway, Spring Gully Road, Tuia Road, Buffa Road and Maslin Street in parts of Hester Brook, Greenbushes, Maranup, Nannup, Donnelly River, East Nannup, Southhampton and Wandillup.