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

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

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

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

Flushing of a gas valve made during maintenance preparation may have led to the deadly explosion at the U.S. Steel Clairton ...

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

U.S. Steel says it believes a gas valve failure led to the explosion Monday morning at its Clairton Coke Works, in which two ...

The Chemical Safety and Hazard Investigation Board’s probe into the deadly explosion at the Clairton Coke Works could take a ...