BARNSDALL — A 14-year-old Barnsdall girl died as a result of a single-vehicle auto accident Thursday morning just south of the Barnsdall Public Schools campus, according to the Oklahoma Highway Patrol. The accident occurred at about 7:59 a.m.

The OHP said a 2002 Ford F350 pickup driven by a 16-year-old male from Barnsdall overturned and ejected the 14-year-old girl, who was a passenger, approximately 40 feet from the road. Neither the driver nor the passenger was wearing a seat belt, according to an OHP report.

The vehicle was eastbound on County Road 2420 when it approached a curve and left the road, the OHP said. Both teens were transported by emergency medical personnel to Jane Phillips Medical Center, Bartlesville. The driver was treated and released, according to the highway patrol. The 14-year-old passenger died at the hospital from internal injuries.

The cause of the accident remained under investigation. The OHP received assistance from Barnsdall municipal, Osage County and Osage Nation first-responders.

The names of the driver and passenger have not been released.

Barnsdall Public Schools Superintendent Jeff Lay said Grand Lake Mental Health counselors and Barnsdall’s high school counselor have provided support services in the immediate aftermath of the accident, and will continue to provide services to students and others as needed.