A U.S. Steel plant south of Pittsburgh exploded Monday morning, killing one person, trapping several people under rubble and injuring dozens, authorities said.

In addition to the person killed, at least two others were unaccounted for following the explosion at Clairton Coke Works on the Monongahela River, according to Allegheny County officials. Local leaders cautioned it was still an “active scene” with a search and rescue operation.

A fire at the plant about 10 miles south of downtown Pittsburgh started just before 11 a.m., Allegheny County Emergency Services said. Dozens of people were injured in the explosion, with numerous ambulances responding to the scene.

“It shook my chest. It shook the building, then we saw the dark smoke rising from the steel mill ,” construction wor

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