An explosion at a U.S. Steel plant in Clairton, Pennsylvania, killed two people and injured at least 10 more Monday, authorities said after rescuers spent hours sifting through the plant’s rubble.

Witnesses described feeling a shock wave and then seeing black smoke spew into the sky shortly before 11 a.m. Part of a building appeared to have been sheared off, and debris littered the area.

Rescuers had found one survivor hours after the explosion, Monday afternoon, and were able to take that person to a hospital as the search continued for one other missing person. That effort ended late on Monday with the discovery of a second body.

Few details were available on the extent of injuries or what caused the explosion near the northern end of the Clairton plant, a sprawling facility covering

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