One person has been killed, two are missing and dozens are believed injured following an explosion Monday at a steel plant in Clairton, Pennsylvania, on the outskirts of Pittsburgh, officials said.

Allegheny County Emergency Services and the Allegheny County Police were responding to the blast at the U.S. Steel Clairton Coke Works plant, the groups said in a social media statement .

"At this point, officials can confirm there has been one fatality in connection with this incident. Two people are currently believed to be unaccounted for, and multiple individuals have been treated for additional injuries," the statement said.

First responders were trying to rescue people trapped in the rubble, the Associated Press reported, adding that the number of injured is in the dozens.

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