U.S. Steel says its preliminary investigation found that the blast happened after pressure built up while a gas valve was ...

U.S. Steel says preparations for a routine maintenance task may have led to an explosion at a U.S. Steel coal-processing ...

An explosion at a steel plant in Pennsylvania on Monday has led to an extremely serious situation. The explosion at the plant ...

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

The fatal explosion last week at U.S. Steel’s Pittsburgh-area coal-processing plant has revived debate about its future just ...

An explosion at the company’s blast furnace/basic oxygen furnace complex in Pennsylvania occurred during a maintenance procedure, according to the steelmaker.

Authorities said their investigation has shifted to the cause of the explosion after they accounted for everyone who was missing.

The preliminary findings say how the company believes the explosion occurred. A union statement cautioned the investigation is in its early stages.

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

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