A bushfire that threatened lives and homes in the semi-rural suburb of Anketell, about 35 kilometres south of Perth, has been downgraded.

The fire burning near Thomas Road triggered a bushfire emergency warning on Monday afternoon, however, the threat to lives and homes has now eased.

A watch and act warning remains in place for people in an area bounded by Battersby Road, Anketell Road, Tuart Road and Thomas Road.

Property on a rural block in Anketell smoulders after a fire tore through the area. ( ABC News )

Authorities say the fire is still out of control and moving in a north-easterly direction.

Ninety firefighters are at the scene, as well as waterbombers.

The charred remains of a boat on a property in Anketell. ( ABC News )

Officers from the Department of Water and Environmental Regulation are also at the scene.

Helicopter vision shows property on several semi-rural blocks on fire, including a boat.

A number of roads in the area have been closed, including Thomas Road from Kwinana Freeway to Tuart Road.

A fire burns on rural properties in Anketell. ( ABC News )

The fire is just a few kilometres from an area where a bushfire tore through last week after originating in Baldivis.

An advice alert is still active for that fire, which has burnt through more than 1,300 hectares.