Regulators are temporarily stepping up pollution monitoring in the Mon Valley after a deadly explosion at U.S. Steel’s ...

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

The office of the Allegheny County medical examiner identified a second man who was killed in an explosion at the Clairton ...

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

The health department began deploying mobile air units Thursday provided by Pennsylvania’s Department of Environmental ...

The Allegheny County Health Department announced that mobile air units provided by the state and Carnegie Mellon University ...

Todd Barrett was with a crew of laborers at the Clairton coke works that morning when they all felt something. It was an ...

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

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

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

Family members tell Pittsburgh's Action News 4 Steven Menefee, a father of two, was a loving man who would give you the shirt off his back.

Allegheny County Executive Sara Innamorato joined ABC News Live with an update on the investigation of the explosion at a ...