GILLETTE, Wyo. (AP) — Authorities are investigating after a worker was killed in a fall at a power plant in Gillette.

Campbell County Fire Department Capt. Chris Beltz tells The Gillette News Record that emergency responders were called to the Black Hills Corp.'s Wygen III power plant east of the city about 9:15 a.m. Friday.

The worker, whose name and age have not been released, died shortly after they arrived. Details about the accident have not been released.

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