A shooter driven by jealousy opened fire and killed four people at a car wash early Sunday morning in Pennsylvania, while a woman hiding in the back of a pickup truck suffered only minor injuries, according to state police and family of the victims.

Police said Timothy Smith, 28, was on life support and not expected to survive after suffering a gunshot wound to his head during the attack at Ed’s Car Wash around 3 a.m. in Saltlick Township, a rural town about 55 miles (89 kilometers) southeast of Pittsburgh. Police said it was possible that the gunshot wound was self-inflicted.

Armed with a semi-automatic rifle, a .308-caliber rifle and a handgun and wearing a body armor carrier without the ballistic panels inserted, police said Smith killed 27-year-old William Porterfield, 25-year-old Chelsie Cline, 23-year-old Courtney Snyder and 21-year-old Seth Cline.

Police would not go into details about how Smith knew the victims, but Chelsie Cline’s half-sister, Sierra Kolarik, told the Pittsburgh Tribune-Review that Smith had developed an obsession with Cline.

Cline shared a meme on her Facebook page last week that read, “After this week, I rlly (sic) need to get taken out … on a date or by a sniper either one is fine w me at this point.” A Facebook friend of hers named Tim Smith replied, “I could do both.”

Porterfield’s pregnant wife, Jenna Porterfield, 24, told the Pittsburgh Post-Gazette that a state police investigator told her that Smith was a jealous former boyfriend of Cline.

Smith was first to arrive at the scene and was parked on the side of the two-bay car wash when Porterfield and Cline arrived, police said. Smith shot them when they got out and walked to the side of the car wash, they said.

Snyder and Seth Cline arrived at the same time and police said Smith opened fire on them. Another woman in the rear seat of the extended cab pickup truck only suffered injuries from broken glass.

Police said Smith had several magazines for the semi-automatic rifle and the handgun.

Ed Bukovac, who owns the car wash, told the Pittsburgh Tribune-Review that a neighbor called him around 4 a.m. Sunday and said something was wrong at his business. Bukovac said police were on the scene by the time he arrived and that he had few other details about what happened.

A man who lives nearby told the newspaper that he heard about 30 gunshots over a span of several minutes.

(AP)