PHILADELPHIA (CBS) – Police are investigating a number of car fires in an apartment complex in Mt. Airy.

Three cars were reportedly damaged in the blaze, which happened in the Princeton Gardens Apartment on the 6900 block of Germantown Avenue.

Police believe the fire was deliberately set, but no arrests have been made. The vehicles (a 2010 Chevy Camaro and a 2008 Mercedes C300) were owned by the same person. The liquid that was used is believed to have been gasoline.