An explosion occurred Monday at a steel factory in Clairton, Pennsylvania, authorities said. A spokesperson for Allegheny County said a rescue operation was underway at U.S. Steel Clairton Coke Works for people trapped under the rubble.

An explosion was reported at the US Steel Clairton plant outside Pittsburgh, Pennsylvania, on Monday, causing multiple injuries and trapping several people, officials say. Allegheny County Emergency Services spokesperson Kasey Reigner confirmed there were "dozens" of injuries but could not confirm fatalities or a cause, CBS News reported.

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. There are no confirmed deaths from the incident,