Another bushfire threatens Baldivis in WA

Lives and homes may be under threat from an out of control and unpredictable bushfire in Perth's south.

A watch and act alert was issued for the eastern part of Baldivis at 4.40pm on Thursday.

The fire is moving quickly northeast, with about 50 firefighters on scene.

There have been a string of suspicious bushfires in Baldivis in recent months.

In February, as many as six fires were lit in the area within the space of 20 minutes.

The cause of the latest blaze is not yet known.