A man and woman, both 18, were killed and two others were hospitalized Sunday evening after a crash in Hacienda Heights, authorities said.
The collision, involving a Toyota Tacoma pickup truck and black four-door sedan, was reported shortly before 7 p.m. near the South Seventh Avenue offramp from the eastbound 60 Freeway, according to the California Highway Patrol.
Two people were initially trapped inside each of the vehicles following the crash, said Officer Jeremy Tolen, a spokesman for the CHP.
Salvador Corrales, a witness, said he tried to help the man and woman inside the truck but found them lifeless.
"It's just something that you don't see every day," Corrales said in an interview. "It was disturbing."
He then rushed to the other vehicle, which had overturned, and discovered two people inside. Corrales said he then helped emergency responders to remove the pair from the car.
The occupants of the Toyota were pronounced dead at the scene, Tolen said. The driver and passenger of the sedan were extricated by firefighters and transported to a hospital with minor injuries, the CHP said.
The agency issued a SigAlert and closed the offramp as crews worked to clear the scene. The offramp was reopened shortly after 11 p.m.
None of the four people involved in the incident was immediately identified.
The cause of the crash was under investigation. Neither drugs nor alcohol was believed to have been a factor, according to the Highway Patrol.