Denver firefighters evacuated a building this morning after a chemical used to kill rodents started smoking, authorities say.

Denver's hazardous-materials unit was called at 9:19 a.m. to a commercial building at 3725 E. 48th Ave., said Alex Paez, Denver Fire spokesman.

Paramedics checked some people who were exposed to the chemical, but no one was injured, Paez said.

A crew of rodent-control workers was applying the chemical in the building when the reaction happened, he said.

"It started smoking pretty excessively," Paez said. "They evacuated the building as a precaution."

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