Rescue operation underway after explosion at Pennsylvania steel plant
Officials say a rescue operation to save people trapped under rubble is underway after an explosion at U.S. Steel Clairton Coke Works in Clairton, Pa. NBC News' Marquis Francis reports on what is known so far about the mass casualty incident.
Officials say a rescue operation to save people trapped under rubble is underway after an explosion at U.S. Steel Clairton Coke Works in Clairton, Pa. NBC News' Marquis Francis reports on what is known so far about the mass casualty incident.
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