U.S. Steel says 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, sent 10 to hospitals and damaged part of the sprawling facility.

The mill, which is part of the recent merger between U.S. Steel and Nippon Steel, has faced scrutiny from federal and local regulators.

Family members tell Pittsburgh's Action News 4 Steven Menefee, a father of two, was a loving man who would give you the shirt off his back.

Authorities on Thursday identified the second person who was killed in an explosion at U.S. Steel’s Clairton Coke Works Monday. Steven Menefee, 52, died at the steel plant Monday, authorities said. The explosion at Clairton Coke Works,