At least one person has died, and one person remains unaccounted for, while at least 10 people have been injured following multiple explosions at the U.S. Steel Clairton plant on Monday.

First responders were alerted to the incident just before 11 a.m.

At an afternoon press conference, officials said a search and rescue operation remains active to locate the lone unaccounted-for employee. Officials believe they know the location of the person, but are not "100% sure," said Scott Buckiso, executive vice president and chief manufacturing officer at U.S. Steel.

Sources relayed to KDKA-TV that the explosions occurred inside the "reversing room" of the 13/15 battery. The room acts as a mechanical regulator, making sure the coal bakes evenly in the oven. The plant has since been stabil

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