An explosion at the US Steel Clairton Coke Works plant in Pennsylvania has resulted in two deaths and at least ten injuries, authorities confirmed on Monday. The blast occurred around 10.51am at the facility near Pittsburgh, sending black smoke into the sky and prompting a search-and-rescue operation.
Allegheny County emergency services reported that the body of one worker was recovered from the wreckage, with a second fatality confirmed later. Abigail Gardner, director of communications for Allegheny County, told local media that a search-and-rescue operation was under way. Witnesses described the explosion as feeling like thunder, shaking nearby structures.
Pennsylvania Governor Josh Shapiro stated that his administration was in contact with local officials and had offered assistance via the state's emergency management agency and state police. US Senator John Fetterman, a former mayor of nearby Braddock, called the incident “absolutely tragic” and expressed support for steelworkers and their families.
The Clairton Coke Works, part of US Steel for over 120 years, is the largest coking operation in North America. It produces coke for blast furnaces, including at US Steel's mill in Gary, Indiana. The plant has a history of safety and pollution concerns, including a 2019 settlement over soot emissions and a February 2025 incident involving a battery problem that caused a boom.
The Breathe Project, a local air quality group, noted that this was the third major incident at the plant in 2025, following a stack explosion in February and a pollution control room malfunction in June. The group warned that the facility may be releasing hazardous pollutants such as asbestos and heavy metals.
