Police are investigating a suspicious vehicle fire in Balga overnight.
The blaze, which caused $10,000 damage to four vehicles at the Ticehurst Way property, was reported at 12.47am.
Fire fighters found the vehicles on fire at the property but the flames had not spread to any other structures, a Fire and Emergency Services Authority spokesman said.
The blaze was believed to have been deliberately lit.
Detectives and the arson squad are investigating.