At least one person has died, and one person remains unaccounted for, while at least 10 people have been injured following multiple explosions at the U.S. Steel Clairton plant.

One person has died, one person is unaccounted for and at least 10 are injured following an explosion at a U.S. Steel plant near Pittsburgh, Allegheny County Police Assistant Superintendent Victor Joseph said at a press conference Monday afternoon.

CLAIRTON, Pa. (AP) — After an explosion rocked a steel plant outside Pittsburgh, workers scrambled into the wreckage alongside firefighters directing streams of water, as black smoke rose into the air.