CLAIRTON, Pa. (AP) — Explosions at a U.S. Steel plant that shook the ground near Pittsburgh left one dead and sent at least ten to hospitals Monday, with emergency workers still searching the badly charred rubble hours later for a missing worker, officials said.

One worker was pulled from the wreckage hours after the explosions sent black smoke spiraling into the midday sky in the Mon Valley, a region of the state synonymous with steel for more than a century. Allegheny County Emergency Services said a fire at the plant started around 10:51 a.m. A search and rescue effort was still active on Monday afternoon and officials said they had not isolated the cause of the blasts.

The explosions sent a shock through the community and led to officials asking residents to stay away from the scene

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