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

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

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

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

Dozens of workers at a steel plant near Pittsburgh are trapped beneath rubble following an explosion, and police have ...

A devoted dad has been identified as one of the two steel workers killed from an explosion at a Pennsylvania steel plant on ...

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

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

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