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ST. LOUIS (AP) _ An explosion at a pallet company in St. Louis has injured two workers.

St. Louis Fire Capt. Garon Mosby says the explosion happened around noon Saturday as the workers were entering a room at Pallet Logistics Management. The St. Louis Post-Dispatch ( ) reports that it appears natural gas had somehow built up in the room that is used to heat up and sterilize pallets.

Mosby says the workers were taken to a hospital and were described as stable. He says the workers weren’t burned and that their injuries were from the blast.

Crews have shut off natural gas service to the building.