Truck found in burning WA business

A tattoo parlour south of Perth is under guard after it was found alight with a truck backed into it in the middle of the night.

Emergency services were called to the Youngbloods tattoo parlour in Rockingham at about 3:10am on Thursday, where they found both the premises and truck burning.

Fire authorities believe the blaze is suspicious and estimate it has caused $500,000 worth of damage.

Police are eager to speak with several people who they believe fled the scene.