Mount Nasura residents are being urged to leave their homes after a "suspicious" bushfire started in the area.
The Department of Fire and Emergency Services has issued a "watch and act" alert for people in the western part of the area.
The alert includes people in an area bounded by Henrietta Avenue, Carawatha Avenue, Rushton Terrace, Salter Road, Paterson Road and Ophelia Grove.
The arson squad is investigating the cause of the fire, which has been deemed suspicious.
The fire started near Carawatha Avenue and Serena Grove at 5.43pm.
The blaze has been been contained and is under control. However, DFES says there is still a potential threat to lives and homes due to windy conditions.
The fire is slowly moving east towards Blackwood Drive and has burnt through five hectares
People are being urged to leave or prepare to defend their properties.
A total of 50 firefighters are at the scene strengthening containment lines. Three helitacs and the air intelligence helicopter have been stood down.
Carawatha Avenue from Albany Highway has been closed as well as all side streets in the vicinity.
'The West Australian' is a trademark of West Australian Newspapers Limited 2013.
All rights reserved.
Select your state to see news for your area.