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

The Pennsylvania county where an explosion at a U.S. Steel plant south of Pittsburgh killed two people and injured more than ...

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

Authorities confirmed a second fatality after an explosion at the U.S. Steel Clairton Coke Works facility outside of ...

Explosions at Clairton Coke Works, a U.S. Steel plant near Pittsburgh, left one dead, two missing and at least seven others ...

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

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