In the last five years, U.S. Steel has paid more than $10 million in penalties for violations of the Clean Air Act at ...

U.S. Steel said its investigation indicates the explosion happened when workers were flushing a gas valve in preparation for ...

The plant, a massive industrial facility along the Monongahela River south of Pittsburgh, is considered the largest coking ...

The preliminary findings say how the company believes the explosion occurred. A union statement cautioned the investigation ...

The deadly explosion at Clairton Coke Works near Pittsburgh occurred when a gas valve was flushed before planned maintenance, ...