An explosion at a U.S. Steel plant near Pittsburgh killed at least one person as rescuers raced to help dozens of people injured or trapped under the rubble on Monday.

The blast happened just before 11 a.m. at the Clairton Coke Works. There has been one death and at least two people are believed to be missing, Allegheny County Emergency Services said.

"Two people are currently believed to be unaccounted for with possible entrapment," Kasey Reigner, Allegheny County Emergency Services spokesperson, said in a statement.

Officials said multiple people have been treated for injuries, though their current status was not immediately known.... Read More: FOX News