McKEESPORT, Pa. (KDKA) --  An investigation is underway in McKeesport after multiple police vehicles in a parking lot caught fire.

Several SUVs in the parking lot were burnt out in the lot that's located along Lysle Boulevard and is used for police cars and other city vehicles.

Four police vehicles in total were burnt out.

Dispatchers tell KDKA that the incident started just before 3:15 a.m. when police officers and firefighters were called to the scene.

Investigators from the ATF and the Allegheny County Fire Marshal's Office were also on scene pictures and collecting evidence.

"I think it's safe to say that it was arson," Mayor Michael Cherepka said.