CLAIRTON, Pa. —

An explosion Monday at a U.S. Steel coking plant near Pittsburgh has left dozens wounded and people trapped under the rubble, with emergency workers on site trying to rescue them, officials said.

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Multiple people have been injured at the Clairton Coke Works, but the extent of those injuries is unknown, said Abigail Gardner, director of communications for Allegheny County.

The Allegheny County Emergency Services said a fire at the plant started around 10:51 a.m. and that it has transported five people.

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 Pittsb

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