A school bus driver died Tuesday from injuries suffered when the bus he was driving crashed into a fence near a San Tan Valley high school,  the Pinal County Sheriff’s Office said.

At around 1:45 p.m., the Sheriff’s Office received a call of the school-bus crash in the 32000 block of North Gantze Road, near Poston Butte High School.

When deputies arrived, they found the bus driver, who was not identified, with serious injuries to his head and abdominal area, officials said.

He was transported to a hospital and pronounced dead there, the Sheriff’s Office said. The driver was on his way to pick up students at the school, officials added.

The assistant bus driver was the only other person in the vehicle, officials said. The assistant was taken to the hospital as a precaution, the Sheriff’s Office said.

The Sheriff’s Office said investigators were not  sure what caused the accident or whether there was a medical issue involved.

The school is part of the Florence Unified School District, which did not immediately respond to a request for comment.

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