A bushfire emergency warning has been issued for several communities south of Perth, affecting areas such as Blythewood, Coolup, Meelon, Nanga Brook, Oakley, Teesdale, and Waroona.

The fire originated in a state forest west of Nanga and is currently moving westward, remaining uncontrolled.

Approximately 200 firefighters are engaged in combatting the blaze, with additional regions being advised to stay alert via watch-and-act notifications.

An evacuation center is operational at the Murray Aquatic and Recreation Centre in Pinjarra for those displaced by the fire.

Arson is suspected in separate fires in Perth's south-eastern suburbs, prompting investigations into incidents in Bedfordale and Maddington.

Some firefighters have received treatment for smoke inhalation, highlighting the dangers faced by emergency responders.

Local authorities are calling for continued vigilance from the public, and updates including emergency warnings are available through the DFES website.