(Reuters) -An explosion at a U.S. Steel plant near Pittsburgh injured multiple people on Monday, and fire crews could be seen battling flames as heavy smoke rose from the facility, according to CBS News and other local news reports.

Dozens of injuries were reported after the explosion at the U.S. Clairton Coke Works plant, which is owned by U.S. Steel, a subsidiary of Nippon Steel, ABC’s WTAE affiliate in Pittsburgh said, without citing sources. The extent of the injuries was not known, it said.

Clairton Mayor Rich Lattanzi told Reuters in a phone interview from the site on Monday that he believed almost a dozen people had suffered severe injuries in the blast.

“I don’t know if people are trapped,” Lattanzi said. “There are ambulances and police and news media everywhere. It’s a horribl

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