CLAIRTON, Pa. (AP) — Explosions at a U.S. Steel plant near Pittsburgh left one dead, two missing and at least nine others in hospitals Monday, with emergency workers searching the badly charred rubble for victims, officials said.

The explosions sent black smoke spiralling into the midday sky in the Mon Valley, a region of the state synonymous with steel for more than a century. An Allegheny County emergency services spokesperson, Kasey Reigner, said one person died and two were currently believed to be unaccounted for. Others were treated for injuries, Reigner said.

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