An explosion rocked a US Steel plant near Pittsburgh on Monday, injuring dozens of people and leaving some trapped under the rubble. The cause of the disaster is unknown.

At least one person has died and two are missing from the incident, according to officials. First responders were alerted to the emergency just before 11 a.m. The explosion sent black smoke into the Pennsylvania sky.

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The Bureau of Alcohol, Tobacco and Firearms is on the scene with other agencies, according to a statement.

The plant, Clairton Coke Works, is located about 10 miles sou

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