Steelworkers at US Steel’s Clairton Coke Works have come forward to expose the long-standing and deadly safety hazards that preceded Monday’s explosion, which killed Timothy Quinn and Steven Menefee and injured ten others.

The Allegheny County Health Department announced that Mobile Air Units will be deployed in the Mon Valley Thursday and Friday as part of an ongoing investigation into the deadly explosion at the U.S.

Don Furko is a mechanical maintenance planner who this week reached his 25th anniversary at the plant. He was working in a different area with the blast took place.