An explosion at a US Steel plant in Clairton, Pennsylvania, has killed two workers and injured at least 10 others, officials confirmed on Monday. The blast occurred at the Clairton Coke Works facility, sending black smoke into the sky and prompting a search-and-rescue operation.
Allegheny County emergency services reported the fire started around 10.51am local time. The body of one worker was recovered from the wreckage hours later, with authorities subsequently confirming a second fatality. The explosion, followed by several smaller blasts, was felt in nearby communities.
Zachary Buday, a construction worker near the scene, described the event to WTAE-TV: “It felt like thunder. Shook the scaffold, shook my chest, and shook the building.” Pennsylvania Governor Josh Shapiro stated his administration was in contact with local officials and offered assistance. US Senator John Fetterman called the incident “absolutely tragic” and expressed support for steelworkers.
The Clairton Coke Works, over 120 years old, is the largest coking operation in North America. It bakes coal into coke for steelmaking. The plant has faced previous safety and pollution concerns, including a February 2025 incident involving a battery problem that caused a “boom” and minor injuries.
In a statement, the Breathe Project, an air quality group, noted this was the third major event at the plant in 2025, warning of potential hazardous emissions. The plant is part of US Steel, which recently finalised a partnership with Japan’s Nippon Steel, a deal approved by President Donald Trump with national security caveats.
