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

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

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

Nearly a week after a mechanical failure led to millions of gallons of water dumping out of Alice Lake at William O'Brien ...

The company released its preliminary findings from an investigation into Monday’s explosion that killed two workers.

Preparations for a routine maintenance task may have led to an explosion at a U.S. Steel coal-processing plant near Pittsburgh that left two dead and sent 10 to hospitals, the company said Friday.