HARRISBURG, Pa. (AP) — The fatal explosion last week at U.S. Steel's Pittsburgh-area coal-processing plant has revived debate ...

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, ...

U.S. Steel released preliminary findings about the potential cause of Monday's deadly explosion at U.S. Steel Clairton Coke ...

Workers were pushing coke out of huge ovens and preparing for maintenance when an explosion rocked a US Steel plant outside ...

Emergency crews responded to an explosion at the Clairton Coke Works, a U.S. Steel plant near Pittsburgh, Pennsylvania.

Explosions at a U.S. Steel plant that shook the ground near Pittsburgh left two people dead and sent at least 10 to hospitals ...