Two Dead in Clairton Coke Works Blast; Investigation Underway

A blast at a U.S. Steel coke plant south of Pittsburgh killed two workers and left more than 10 others injured, with one person trapped for hours before being rescued from the rubble. The Clairton Coke Works, described as the largest coking operation in North America, resumed the focus of investigators, company leaders, and nearby residents as authorities raced to determine what caused the explosion and to assess the site’s safety for workers and the surrounding community.

The explosion occurred Monday morning at the Clairton plant along the Monongahela River, and was powerful enough to shake nearby homes. A plume of black smoke rose over the Mon Valley, and a section of the facility was damaged, with a wall knocked down and vehicles scorched. Rescue teams initially contained the area and prioritized stabilizing the building before entering to reach the trapped worker. That rescue was credited to a coordinated effort by the county’s emergency services and a specialized urban search-and-rescue unit. By evening, five workers remained hospitalized in critical but stable condition, while others were treated and released.

Officials from U.S. Steel, which operates Clairton through its...