Police are investigating a three-hour arson spree that left three cars and a trash bin damaged early Sunday morning.
A report of the first car fire, which was on the second floor of a condominium parking structure in the 100 block of McLellan Drive, came in around 1:05 a.m., according to South San Francisco police. The flames and damage were contained to one vehicle.
Just as officers were wrapping up their investigation, another car fire was spotted across the street on the third floor of a parking structure. As information on that fire came in, someone reported a garbage bin behind a business a few blocks away was on fire.
While firefighters were battling those two blazes, a fourth fire was reported at the same parking structure as before in the 100 block of McLellan. A car on the third floor had been set ablaze, police said.
The San Mateo County bomb squad and an arson dog took part in the investigation, but police made no arrests. South San Francisco police and fire investigators are looking into the cause of the blazes.