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Explosions at US Steel plant leaves two dead, 10 injured

Published by Global Banking & Finance Review

Posted on August 11, 2025

3 min read

· Last updated: January 22, 2026

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Explosions at US Steel plant leaves two dead, 10 injured
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By Rich McKay and Julia Harte (Reuters) -Multiple explosions at a U.S. Steel plant near Pittsburgh killed at least one person and injured 10 others, authorities said on Monday, and emergency crews

Two Fatalities and Ten Injuries in U.S. Steel Plant Explosions

By Rich McKay and Julia Harte

(Reuters) -Multiple explosions on Monday at a U.S. Steel plant near Pittsburgh 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 11 a.m. ET (1500 GMT). Firefighters battled flames and heavy smoke that billowed out of the plant, which is owned by U.S. 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, U.S. Steel said in an emailed statement to Reuters late on Monday.

There was no word yet on a possible cause of the explosion.

The probe into the explosion would be "a time-consuming technical investigation," Joseph said.

David Burritt, president and chief executive officer of U.S. Steel, said in a statement that the company was working with local authorities to discover the cause.

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 local authorities," he wrote at the time the employee was missing.

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 20 miles (32 km) south of Pittsburgh, long known as America's Steel City.

U.S. 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 $14.9 billion acquisition of U.S. Steel after an 18-month struggle to obtain U.S. 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 Monday's explosions, residents within 1 mile 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 tons 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.

(Reporting by Rich McKay in Atlanta and Julia Harte in New York; Additional reporting by Ryan P. Jones in Toronto and Disha Mishra in Bengaluru; Editing by Frank McGurty, Lisa Shumaker and Sonali Paul)

Key Takeaways

  • Two people dead and ten injured in US Steel plant explosions.
  • Incident occurred at Clairton Coke Works near Pittsburgh.
  • Investigation into the cause of the explosion is ongoing.
  • Residents advised to stay indoors due to air quality concerns.
  • Nippon Steel recently acquired US Steel for $14.9 billion.

Frequently Asked Questions

What happened at the U.S. Steel plant?
Multiple explosions occurred at the U.S. Steel plant near Pittsburgh, resulting in two fatalities and ten injuries.
What is the current status of the investigation?
The investigation into the cause of the explosions is expected to be time-consuming, with U.S. Steel cooperating with local authorities.
How many workers are employed at the Clairton Coke Works?
The Clairton Coke Works employs about 1,300 workers and is the largest coke manufacturing facility in the United States.
What safety measures were advised for residents nearby?
Residents within one mile of the plant were advised to remain indoors and close windows and doors following the explosions.
What has been the historical significance of U.S. Steel in the area?
U.S. Steel has been producing steel in the area since the late 19th century, although the industry has faced decline in recent decades.

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