AN EMERGENCY warning has been expanded for residents in the path of an unpredictable bushfirein Western Australia's southwest.
The fire is threatening lives and homes.
The warning now includes residents south of Spring Gully Road, west of South Western Highway including Bridgetown, north of Brockman Highway and east of Wetherley Road in the Shires of Donnybrook-Balingup, Bridgetown-Greenbushes and Nannup.
Homes in these areas are being impacted by fire, authorities warn.
"You are in danger and need to act immediately to survive," the Department of Fire and Emergency Services (DFES) said.
"There is a threat to lives and homes."
The fire started at River Road from a lightning strike yesterday, had crossed a river and was burning in a south-easterly direction.
Meanwhile, a watch-and-act alert has been issued for people south of Hay Road and Greenbushes-Boyup Brook Road including the Greenbushes town; west of Kendall Road, Winnejup Road, Wheatley Giblett Road and Carbanup Brook Road; and north of Glentulloch Road, in the Shires of Donnybrook-Balingup, Bridgetown-Greenbushes and Nannup.
Those fires are within containment lines, but conditions are hot and dry with variable winds, so the situation could change rapidly if the fires break out, the DFES warns.
More than 130 personnel from the Department of Environment and Conservation, DFES, the Forest Products Commission and local volunteer bushfire brigades are working on fires in the area.
Firefighters are being assisted by four water bombers and a helicopter.