The fatal explosion last week at U.S. Steel's Pittsburgh-area coal-processing plant has revived debate about its future just ...

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