The freeway ramp was closed temporarily after the accident.
Sahuarita Police Lt. Henry Leyva said the car rolled and one girl was ejected, as the car may have tried to make the turn to the off-ramp too late.
The driver and front-seat passenger were not wearing seat belts at the time of the collision, DPS said. It was not known if the two backseat passengers had belts on.
The investigation will be handled by DPS and the Sahuarita Police Department was handling traffic and other support duties.
Top school officials went to the scene and dispatched counselors to the scene and to the high school. They were planning to supplement school counselors with some from Northwest Fire District Wednedsay morning, Superintendent Jay St. John said.
“It’s a tragedy, always, when you have 16-year-olds. They have great reflexes, but lack the judgment of an older person,” St. John said.
School officials told students through the internal high school television system that there had been an accident but were awaiting official confirmation of the identities of those involved.
“We don’t have much information. We’ll let them know as soon as we can. We told them they are to remain in class today and at the end of the day we will do counseling and develop a plan for tomorrow (Wednesday),” St. John said.
Assistant Superintendent Manny Valenzuela was coordinating media relations for the school district.
pfranchine@sahuaritasun.com | 547-9738