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

U.S. Steel released preliminary findings about the potential cause of Monday's deadly explosion at U.S. Steel Clairton Coke ...

The company said pressure likely built up inside the valve, causing it to fail and leading to coke oven gas filling the area, ...

U.S. Steel has released new details on what investigators believe caused the explosion at the Clairton Coke Works plant that ...

U.S. Steel Clairton Coke Works' current limited coke-making capacity due to Monday's explosion is prompting concerns.

The explosion happened when workers were flushing a gas valve in preparation for maintenance on two of the plant's coke oven ...

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

LIMA, Peru — An explosion on a street in a northern Peruvian region plagued by organized crime injured at least 10 people and damaged 25 homes, authorities said Friday.

The mill, which is part of the recent merger between U.S. Steel and Nippon Steel, has faced scrutiny from federal and local ...

U.S. Steel released preliminary findings about the potential cause of the deadly explosion at U.S. Steel Clairton Coke Works ...

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