Authorities continued their investigation Tuesday into a head-on collision in Thousand Palms that left two adults with major injuries.
The crash was reported shortly before 9:30 p.m. Monday on Varner Road, west of Cook Street, according to the California Highway Patrol.
Officers determined that a Hyundai traveling eastbound on Varner Road and a Toyota traveling westbound collided head-on for unknown reasons.
Two adult occupants were taken to Desert Regional Medical Center in Palm Springs.
Alcohol and/or drugs are not suspected to be a contributing factor in the crash, according to CHP Officer David Torres.