CLAIRTON, Pa. —

Multiple people were injured Monday in an explosion at the U.S. Clairton Coke Works plant in Pennsylvania, a source told sister station WTAE .

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Multiple people have been injured, according to dispatchers. The extent of those injuries is unknown.

Helicopter footage below shows heavy smoke rising from the scene as fire crews battle flames.

The plant is located along the bank of the Monongahela River, approximately 20 miles south of Pittsburgh in Clairton, Pennsylvania.

The plant is the largest coke manufacturing facility in the U.S. and operates 10 coke oven batteries and produces approximately 4.3 million tons of coke annually, according to U.S. Steel.

"Just a report of an explosion! Asking for multiple a

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