
Firefighters spray water on the site of an explosion at U.S. Steel's Clairton Coke Works plant in Clairton, Pennsylvania, U.S., August 11, 2025 in this screengrab obtained from an aerial video. Photo: Reuters
The cause of the explosion is unknown.
The blast happened at U.S. Steel's coke works in Clairton, near Pittsburgh, Pennsylvania, around 11:00 am local time.
According to the company, some 1,300 employees work at the facility.
The Clairton coke works is one of the largest coke-manufacturing facilities in the United States.
U.S. Steel CEO David Burritt said that the company is working closely with relevant authorities to investigate the cause of the explosion.
U.S. Steel became a wholly owned subsidiary of Nippon Steel in June.
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