Firefighters believe some cardboard caught fire after a wall heater malfunctioned.
Internal sprinkler systems put the fire out, but the area also contained an ammonia pump. A hazmat team was called in by the storage company.
“They showed up here and made sure that the ammonia system was working correctly and it is,” said Rob Bowen, the Riverside Fire District Fire Chief. “So there’s no fear to the public or anything.”
Fire crews started packing up around 6:00 PM.
All employees evacuated the building without injury.
There was light smoke damage to the building.