HARRISBURG, Pa. (AP) — 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.

U.S. Steel has released new details on what investigators believe caused the explosion at the Clairton Coke Works plant that killed 2 people and injured 10 others.

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.

Washington Examiner senior columnist Salena Zito noted the importance of steelworkers amid the loss of two employees who died in an explosion at a US Steel plant during her appearance on the Hugh Hewitt Show.

US Steel CEO David Burritt on plant explosion: "We have suffered heartbreaking losses." The Polish beauty is a true stunner. A painful three-decades-long search can finally come to a close. He's apparently showing his "true colors."

First responders are on scene at the U.S. Clairton Coke Works plant in Pennsylvania as one worker remains unaccounted for.