Explosions at US Steel plant leaves two dead, 10 injured
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Firefighters spray water on the site of an explosion at US Steel's Clairton Coke Works plant in Clairton, Pennsylvani on Aug 11, 2025 in this screengrab obtained from an aerial video.
REUTERS
PITTSBURGH, Pennsylvania - Multiple explosions at a US Steel plant near Pittsburgh on Aug 11 killed two people and injured 10 others, according to the company and local authorities.
The blasts at the Clairton Coke Works - part of a sprawling industrial complex along the Monongahela River - took place just before 11am ET.
Firefighters battled flames and heavy smoke that billowed out of the plant, which is owned by US Steel, a subsidiary of Nippon Steel.
Initially, two people were reported missing.
One person was found and transported to a local hospital, said Allegheny County Police Assistant Superintendent Victor Joseph at an afternoon briefing.
The other individual, who had been missing, was found deceased following an extensive search and rescue effort, US Steel said in an emailed statement to Reuters late on Aug 11.
There was no word yet on a possible cause of the explosion.
The probe into the explosion would be “a time-consuming technical investigation,” Mr Joseph said.
Mr David Burritt, president and chief executive officer of US Steel, said in a statement that the company was working with the local authorities to discover the cause.
A Salvation Army Disaster Services vehicle is seen near the entrance to US Steel’s Clairton Coke Works following an explosion at the plant in Clairton, Pennsylvania, on Aug 11, 2025.
PHOTO: AFP
Pennsylvania Governor Josh Shapiro posted on X that there were multiple explosions at the plant and that his administration was in touch with local officials.
“The scene is still active, and folks nearby should follow the direction of the local authorities,” he wrote at the time the employee was known to be missing.
US Steel’s Clairton Coke Works plant is seen after an explosion in Clairton, Pennsylvania.
PHOTO: REUTERS
The severity of the injuries was not known, but news accounts said that several people were taken to hospital burn units.
Clairton Mayor Rich Lattanzi said it was a horrible day for the city, about 32km south of Pittsburgh, long known as America’s Steel City.
US Steel has produced steel in the area since the late 19th century, but in recent decades, the industry has been in decline, leading to plant closures and restructurings.
In June, Nippon Steel, Japan’s biggest steelmaker, closed its US$14.9 billion (S$19.17 billion) acquisition of US Steel after an 18-month struggle to obtain US government approval for the deal, which faced scrutiny due to national security concerns.
While air quality monitors did not detect a dangerous rise in sulfur dioxide after Aug 11’s explosions, residents within 1.6km of the plant were advised to remain indoors, close windows and doors, set HVAC systems to recirculate, and avoid activities that draw in outside air, said Allegheny County executive Sara Innamorato at the briefing.
The Clairton Coke Works is the largest coke manufacturing facility in the United States, employing about 1,300 workers.
It operates 10 coke oven batteries, which produce about 4.3 million tonnes of coke a year.
Coke is produced by heating coal at high temperatures. It is used in blast furnaces as part of the process of making steel. REUTERS
