Rescue crews raced to save multiple people trapped beneath the rubble after an explosion at a U.S. Steel plant near Pittsburgh on Monday, an official said.

The blast happened just before 11 a.m. at the Clairton Coke Works.

Abigail Gardner, director of communications for Allegheny County, told The Associated Press there are no confirmed fatalities yet.

Clairton Mayor Rich Lattanzi told KDKA-TV that there have been reports of multiple injuries.

The Allegheny County Emergency Services said it had transported at least five people, though did not immediately provide more details.

Lattanzi said he heard that the explosion happened in the "reversing room between thirteenth and fifteenth battery," which is part of the control system of the coking factory.

Pennsylvania Gov. Josh Shapiro

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