Southeast WA bushfire risking homes, lives

Authorities in Western Australia have reissued a watch and act message for bushfire that is burning on the state's south coast.

Emergency WA has issued a watch and act message for Bremer Bay and Boxwood Hill, southeast of Perth. (AAP)

A bushfire is continuing to threaten lives and homes on Western Australia's southern coast.

On Christmas Day Emergency WA reissued a watch and act message for Bremer Bay and Boxwood Hill, southeast of Perth.

"There is a possible threat to lives and homes as a fire is approaching in the area and conditions are changing," the release said

"You need to leave or get ready to actively defend."

The fire is burning on the western side of Dillon Bay Road. It is burning against the wind in a southeasterly direction.

More than 100 firefighters are in the area, working to actively fight the blaze and strengthen containment lines.

The fire was first reported on Thursday last week and has already burnt through more than 8000 hectares of scrub.