TISHOMINGO, Okla. (AP) — Six teenage students were killed in a two-vehicle collision in southern Oklahoma, the Oklahoma Highway Patrol said Tuesday.

Only the car’s 16-year-old driver and front-seat passenger were wearing seat belts when the 2015 Chevrolet Spark carrying the girls collided with the rock hauler Tuesday afternoon in Tishomingo, a rural city of about 3,000 located about 100 miles southeast of Oklahoma City, the highway patrol said Wednesday.

Those killed include the 16-year-old driver, three 15-year-olds and two 17-year-old passengers, the highway patrol said.

All six victims were female. The girls’ names weren’t released because they are juveniles.

The Patrol said Wednesday that the students had been riding in a small car, with only four seats.

The crash report, released Wednesday morning, said the circumstances of the wreck remained under investigation. But OHP Trooper Shelby Humphrey said Tuesday night that the girls’ car was making a right turn when it collided with the truck, KXII-TV reported.

Highway patrol identified the driver of the semi as Valendon Burton, 51, of Burneyville, Oklahoma. The report said Burton was not injured in the crash.

Images from the scene of the crash showed a virtually destroyed black vehicle with what appeared to be a pink steering wheel among the rubble.

Tishomingo Public School Superintendent Bobby Waitman said in a Facebook post that the district had “a great loss” involving students from the district’s high school.

“Our hearts are broken, and we are grieving with our students and staff,” said Waitman, who did not immediately return a phone call Tuesday.

Waitman said counselors would be available at the high school throughout the night Tuesday and that school would be open on Wednesday with a focus on “the emotional well-being of our students.”

This crash comes only a week after nine people were killed, including six members of a New Mexico college’s golf team and their coach- in a crash in West Texas. A 13-year-old boy had been behind the wheel of the truck when it crossed the centerline and collided with a van carrying students from the University of the Southwest golf team, the National Transportation Safety Board determined.