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

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

The Allegheny County Health Department announced that Mobile Air Units will be deployed in the Mon Valley as part of an ongoing investigation.

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

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

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 ...

When horrific situations strike in the Pittsburgh area, such like the U.S. Steel Clairton coke plant explosion that killed ...

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