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

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

The deadly explosion at Clairton Coke Works near Pittsburgh occurred when a gas valve was flushed before planned maintenance, U.S. Steel said in preliminary findings.

Workers were heating coal and preparing for routine maintenance when an explosion rocked a U.S. Steel plant outside Pittsburgh

A devoted dad has been identified as one of the two steel workers killed from an explosion at a Pennsylvania steel plant on Monday, officials said.

Timothy Quinn, 39, of East Huntingdon Township, also died in the incident. Ten other people were injured. Three of them are still hospitalized.

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.

Authorities said their investigation has shifted to the cause of the explosion after they accounted for everyone who was missing.

"God is working through her. She's definitely a light within our neighborhood right now, for sure," Finch said. "It gets scary. But if we stand beside each other, if we support each other, that's what it's about.

"In science fiction, there are scenes where a beam is fired at something to destroy it, causing an explosion with debris flying back at the shooter. Similar things occur in real astronomical phenomena,

The explosion at U.S. Steel's Pittsburgh-area plant has reignited debate about its future. The plant, part of a long-standing steelmaking tradition in the Mon Valley, faces uncertainty despite recent investments.