An elderly man was rescued by neighbours from his home in Nollamara last night after it was gutted by a fire believed to have started in the carport.
Fire fighters were called to the property on Newhaven Crescent about 11.15pm but by the time they arrived the blaze had already spread to the roof.
The sole occupant, aged in his 80s, watched from across the street as his home was destroyed by the fire. Neighbours used a garden hose to stop the blaze jumping the fence.
Police and the Department of Fire and Emergency Services attended the fire and say a man was seen acting suspiciously near the house before the fire started.
Arson Squad officers will examine the gutted property this morning. It is understood the elderly man is now staying with family.
Police also believe the blaze could be linked to a separate car fire just one street away that was reported about four hours later.
Emergency services were called back to Eastborne Crescent in Nollamara about 3.40am and because of the time and location, it is believed the fires could be related. Arson Squad officers will also assess the burnt-out vehicle today.
Anyone with information about the fires, or who saw anyone acting suspiciously in the area at the time, is asked to call Crime Stoppers on 1800 333 000 or report the information online at www.crimestopperswa.com.au.
Rewards of up to $50,000 are on offer for information that leads to the identification and conviction of an arsonist.