An explosion at a US Steel plant in Clairton, Pennsylvania, has left two workers dead and at least 10 injured, authorities confirmed on Monday. The blast occurred at the Clairton Coke Works facility around 10:51 am local time, sending black smoke into the sky and prompting a search-and-rescue operation. Allegheny County emergency services reported that one worker's body was recovered from the wreckage, with a second fatality confirmed later.
Witnesses described the explosion as feeling like thunder. Zachary Buday, a construction worker near the scene, told local media: "It felt like thunder. Shook the scaffold, shook my chest, and shook the building." The blast, followed by several smaller explosions, was felt in the surrounding community, and officials urged residents to stay away to allow emergency responders access.
Pennsylvania Governor Josh Shapiro said his administration was in contact with local officials and had offered assistance through the state's emergency management agency and state police. US Senator John Fetterman, a Democrat who previously served as mayor of nearby Braddock, called the incident "absolutely tragic" and expressed support for the steelworkers and their families.
The Clairton Coke Works, located about 20 miles south of Pittsburgh, is the largest coking operation in North America. The plant, which has been operating for over 120 years, processes coal into coke for use in steelmaking. It has faced previous safety and pollution concerns, including a 2019 settlement over emissions and a minor explosion in February 2025 that caused no serious injuries.
The Breathe Project, an air quality advocacy group, noted that this was the third major incident at the plant in 2025, following a stack explosion in February and a pollution control malfunction in June. The group warned that the facility may be releasing hazardous pollutants such as asbestos and heavy metals. The plant is part of US Steel, which recently finalised a partnership with Japan's Nippon Steel, a deal approved with conditions by President Donald Trump.
