U.S. Steel, Pennsylvania and Coke Works
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The deadly blast at the U.S. Steel facility outside Pittsburgh was just the latest in a series of recent workplace accidents.
The U.S. Steel plant in Clairton, Pa., where an explosion killed two workers and injured 10 on Monday, has a history of maintenance issues, explosions and environmental violations.
Emergency responders are working to free people trapped under rubble at the Allegheny County plant, the Associated Press has reported.