U.S. Steel says preparations for a routine maintenance task may have led to an explosion at a U.S. Steel coal-processing ...

Flushing of a gas valve made during maintenance preparation may have led to the deadly explosion at the U.S. Steel Clairton Coke plant.

U.S. Steel has released new details on what investigators believe caused the explosion at the Clairton Coke Works plant that ...

The explosion happened when workers were flushing a gas valve in preparation for maintenance on two of the plant's coke oven ...