Multiple people have been injured in Pennsylvania, and several medical helicopters have been dispatched to the area.

One person has died and dozens are reportedly injured or trapped under rubble following an explosion at a U.S. Steel 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 ...

Clairton, Pennsylvania was rocked Tuesday by an explosion at the U.S. Steel Clairton Coke Works. Clairton Mayor Richard ...

A devoted dad has been identified as one of the two steel workers killed from an explosion at a Pennsylvania steel plant on ...

Two workers died and at least 10 people were injured after multiple explosions at the U.S. Steel Clairton plant.

Allegheny County is increasing air quality monitoring after an explosion at a U.S. Steel plant south of Pittsburgh killed two ...

Clairton, Pennsylvania, Mayor Richard Lattanzi spoke with NBC News' Gadi Schwartz about the deadly explosion at a steel ...

The deadly blast at the U.S. Steel facility outside Pittsburgh was just the latest in a series of recent workplace accidents.

An explosion at a U.S. Steel plant south of Pittsburgh killed two people and injured more than 10 others. The CEO has vowed ...

Preparations for a routine maintenance task may have led to an explosion at a U.S. Steel coal-processing plant near ...

Workers were heating coal and preparing for routine maintenance when an explosion rocked a U.S. Steel plant outside ...