Officers are continuing investigations into accidents this week that killed two women.

The first occurred Wednesday at 2:05 a.m. on Arrowhead Trail in Spanish Fork. Jeanette Mortensen, 18, Orem, died from serious head and back injuries after being thrown from a car.A Utah County sheriff's dispatcher said the driver, James Chapple, 19, Spanish Fork, lost control of his car. He, Mortensen and Jason Taylor, age unavailable, were thrown from the vehicle.

All were taken to Mountain View Hospital. Chapple and Taylor were treated and released, and Mortensen was flown to the University Hospital in Salt Lake City, where she was pronounced dead.

The second accident occurred at 12:30 a.m. Thursday. Julianna Crosby died after being trapped in a car that plunged into the Provo River two miles above the mouth of Provo Canyon.

Crosby, Stewart Reeves and Patrick Harold Newton, all 18-year-old Brigham Young University students, were eastbound when Newton lost control of the car and it flipped into the river, landing upside down, said a Utah Highway Patrol dispatcher.

Newton swam to safety; Reeves found an air pocket and awaited rescuers. Crosby's legs were pinned, holding her under water, the dispatcher said.

Doctors at Utah Valley Regional Medical Center pronounced Crosby dead at about 1:45 a.m. Reeves and Newton were treated for cuts and abrasions, and were released.

Investigators have ruled out alcohol as a factor, the dispatcher said.