CLAIRTON, Pa. (AP) — Moments after an explosion erupted at a U.S. Steel plant outside Pittsburgh, company firefighters, local responders and employees raced in to rescue people from the smoldering wreckage.

They were able to free one injured worker who was whisked to a hospital. But one more was still missing, and the area was too unstable to continue working, according to Matthew Brown, chief of Allegheny County Emergency Services.

A Pittsburgh-based crew from Pennsylvania Urban Search & Rescue was called in to help, some of whose members were already responding through their affiliations with local fire departments, Brown said. The team stabilized a wall at the plant and used an advanced camera to detect the missing employee. They pulled away the rubble and were able to extract the b

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