Bushfire emergency in WA southwest

The warning says people in the area are in danger and need to act immediately to survive, with the fire a threat to lives and homes.

The alert level for the fire has been upgraded due to weather conditions and the fire is escalating in heavy fuels.

The fire started near Ritter Road and Fly Brook Road, and is now moving slowly northwest.

Residents are being advised to leave now for a safer place.

If they cannot leave, they are advised to prepare to shelter in a room with water and two exits, such as a kitchen or laundry.

More than 70 firefighters are at the scene working to strengthen containment lines.

Aerial support has been sent to assist ground crews.