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Lives and homes are under threat from an out-of-control bushfire in Western Australia’s South West region.

A watch-and-act alert has been issued for people in Riverslea in the Shire of Augusta-Margaret River.

“There is a possible threat to lives and homes as a fire is approaching the area and conditions are changing,” the Department of Fire and Emergency Services (DFES) said.

“You need to leave or get ready to actively defend.”

The blaze is moving in a northerly direction and is burning towards Birch Loop, Banksia Chase and Tingle Avenue.

DFES warns burning embers are likely to be blown around homes and spot fires are starting up to 300 metres ahead of the fire with flames that are five metres high.

The fire was reported at 10.40am (WST) on Sunday.

The cause of the blaze is unknown.