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Fire investigators on Thursday afternoon were venting a University of Utah building after a small explosion occurred in a storage room.

About 11:10 a.m. Thursday, there was an explosion in a storage room of the Henry Eyring chemistry building. The explosion started a small fire, which was extinguished by a sprinkler, said Salt Lake City Fire spokesman Jasen Asay.

Hazardous materials crews determined that a chemical reaction happened inside "a specialized cabinet, which contained the small explosion," according to the department. The heat from the explosion was enough to melt the cabinet and activate a sprinkler, the department added in a tweet.

Crews also found hazardous materials in the air inside the building, and at 3 p.m. were venting the air and monitoring the air outside, according to the fire department.

The building was evacuated. No one was reported injured.

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