PRAIRIE DU CHIEN, Wis. (From KWWL) -- Fire crews were called to Universal Forest Products in Prairie du Chien, Wisconsin just before 11 a.m. on Thursday morning for reports of a fire and an explosion.

Police officers, firefighters and EMS workers were called in when a machine in the building apparently backed up, created a lot of smoke and exploded.

Nobody was hurt.

Investigators are still working to determine what caused the fire.