Update 9pm
A bushfire that threatened lives and homes in the Shire of Mundaring has been downgraded after more than eight hours.
A bushfire that started near the intersection of Horton Road and Great Southern Highway at The Lakes has been upgraded to a bushfire emergency.
The fire was reported just after 1pm on Wednesday.
An emergency warning had previously been issued for parts of the Lakes, Beechina, Copley, Woottating and Wooroloo.
Homes in the area are no longer under threat.
The fire is stationary, contained but not controlled.
Western Power has advised 142 homes in the area are without power.
Reconstruction works to repair and replace damaged infrastructure which will commence at 7.30am on Friday by Western Power.
Update 6.55pm
Wariin Road, Horton Road and Inkpen Road are closed.
Currently there has been 276 hectares burnt.
The cause of the fire is unknown.
DFES is managing the fire.
Firefighters are actively fighting the fire and strengthening containment lines.
More than 100 Career fire and Rescue Service, Volunteer Fire and Rescue Service, Bush Fire Service firefighters are on the scene.
4.08pm
A bushfire that started near the intersection of Horton Road and Great Southern Highway at The Lakes has been upgraded to a bushfire emergency.
The fire was reported just after 1pm on Wednesday.
Bushfire emergency warning has been issued for parts of the Lakes, Beechina, Copley, Woottating and Wooroloo.
Residents have been told that they need to act immediately to survive.
There is a threat to lives and homes.
The Department of Fire and Emergency Services said the alert level for the fire has been upgraded as homes are under threat.
The bushfire is moving fast in a south easterly direction and is out of control and unpredictable.
DFES said burning embers are likely to be blown onto homes.
Firefighters are on the scene, actively fighting the fire.
For more information visit www.emergency.wa.gov.au.