A woman died after a beam fell onto two cars on the 10 Freeway in Ontario early Thursday, according to the California Highway Patrol.
According to preliminary information, a Kentworth tractor that was pulling a flatbed trailer combination carrying a large excavator crashed into the Interstate 15 overpass.
The crash caused a metal beam to fall onto two vehicles.
The beam fell onto the vehicle of a woman who was also driving westbound on the freeway. A man who was also headed westbound then crashed into the beam, the CHP said.
Both the man and the woman were transported to a medical center with major injuries. The woman was pronounced dead shortly before 7 a.m.
The driver of the tractor, identified as a 50-year-old man from the city of Mira Loma stayed at the scene during the investigation.
According to CHP, alcohol or drugs were not suspected to be a factor in the crash.
The westbound 10 Freeway was closed as cleanup and the investigation continued.