Emergency crews responded to reports of a fire and explosions at a shop on Bryan Stock Trail and Metro on Wednesday afternoon.
Crews from Natrona County, Casper and Mills responded to the blaze.
Everyone was evacuated and safe by the time crews arrived to find the building engulfed in flames, according to Casper Fire-EMS Dane Anderson.
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Crews battled the extreme cold during the event, including freezing gear and clothing and protecting against frostbite in the near-zero degree weather, according to Anderson.
The investigation is being turned over to Natrona County Fire District.