COLUMBUS, WI (WTAQ) - Authorities in Columbus are trying to determine how a small explosion and fire occurred at the American Packaging Corporation.

Firefighters were called around 12:30 p.m. Monday.

Officials said the building’s sprinkler system had put out the fire. No one was hurt.

There was a report that somebody was missing, but the person was found outside a short time later.

Employees were evacuated for a time.

The Columbus packaging plant recently added 100,000 square feet at a cost of $17.5 million. The plant also had an explosion in 2009 which killed a 47-year-old worker.