An explosion Monday at a U.S. Steel plant near Pittsburgh has left dozens injured or trapped under the rubble, with emergency workers on site trying to rescue them, officials said.

There are no confirmed fatalities at the Clairton Coke Works, said Abigail Gardner, director of communications for Allegheny County. The explosion sent black smoke spiraling into the midday sky in the Monongahela Valley, a region synonymous with the state for more than a century.

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The Allegheny County Emergency Services said a fire at the plant started around 10:51 a.m. and that it has transported five people. The agency did not provide any more details on those people transported and would only say it was an “active scene.”

The plant, a mass

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