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BROOMFIELD, Colo. — A driver died after being run over by his semitruck and dragged about 200 feet on Thursday morning, the Boulder County Sheriff’s Office said.

The incident happened on Highway 128 at Eldorado Boulevard, on the south side of Omni Interlocken Golf Club, just before 6:30 a.m.

Officials said the semitruck driver was working on something toward the back of the vehicle when something went wrong. Officials aren’t sure exactly what happened but believe the semitruck somehow shifted into gear.

The semitruck began to roll and pinned the driver underneath the tires, dragging him about 200 feet before coming to a stop, officials said. Another semitruck stopped at the scene and called for help.

The driver was conscious when the first officer arrived but was unconscious when the first medical team arrived at the scene.

Several emergency personnel worked to extricate the man. About 7:30 a.m., he was extricated and placed on an emergency medical helicopter to take him to a Denver hospital.

The man had a pulse and his heart was still beating when he was placed into the helicopter, but he had severe injuries to the lower half of his body. He was later pronounced dead.

The name and age of the man have not been released.

Highway 128 was closed between Eldorado and Indiana Street because of the incident, the Colorado Department of Transportation said. It reopened about 9:45 a.m.