Two workers were injured after an explosion at the Agri Star meat packing plant in Postville, IA Monday.

According to police, the explosion happened at about 3 p.m. and was casued by a leak in a liquid propane cylinder.

The two injured workers were in the room when the explosion occurred. One had facial burns; the other had chest pains. Both were taken to a local hospital.

At least part of the plant was operational after the explosion.