WASHINGTON, Jan. 28 (Xinhua) -- Four people were killed during a shooting at a car wash in a small town in suburban Pennsylvania on Sunday, state police said.

The shooting took place at Ed's Car Wash shortly before 3 a.m.(0800 GMT) in Melcroft, about 80 km southeast of Pittsburgh, police said.

Police initially said five people were killed but later clarified that the suspect who was gravely injured is on life support at a local hospital. Another woman hiding behind a pickup truck at the scene suffered only minor injuries.

The shooter, 28, was reportedly armed with an AR-15 semi-automatic rifle, a 9mm handgun, and a 308 rifle, and had several magazines for those weapons.

The shooting was the result of a domestic dispute, according to local media.