Police are investigating three arson attacks in Perth's northern suburbs.
Firefighters were called to Federal Street in Tuart Hill just before 4am on Saturday morning, where a boat had been deliberately set on fire, causing $40,000 damage.
A short time later a car was found on fire in the same street.
Later two more cars were set on fire on Regent Street in Alexander Heights, 10km north of Tuart Hill.
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