The cause of the incident is still under investigation by the S.C. Highway Patrol, but apparently the truck struck a couple of trees upon impact.

The male driver and a 15-year-old female passenger were flown by helicopter to Spartanburg Regional Medical Center and a male passenger, identified as John Romero, 18, was treated and released on Saturday from Spartanburg Regional. Romero is reported to have been in the middle of the truck.

The names of the other two victims have not yet been released because they are juveniles.

The driver was reportedly trapped in the vehicle for about 20 minutes before he was airlifted. WSPA reported Monday afternoon that the driver was charged with driving too fast for conditions.

Spartanburg County District One Schools Public Information Officer Cathy McMillan issued a statement last Friday evening saying that the injuries are not life-threatening. She reported then that the students had a lot of cuts and bruises and one student suffered a leg injury.

About a year ago in September, 16-year-old Landrum High School sophomore Cole Quinn died in a one-vehicle crash going home from school. The driver and another passenger were also injured in the accident.

Polk County High School&squo;s Joshua Dodson, who was 17, was also killed last October in a one-vehicle crash.