Multiple explosions at a U.S. Steel plant near Pittsburgh killed at least one person and injured 10 others, authorities said on Monday, and emergency crews were searching through the rubble for an employee believed to be missing.

The blasts at the Clairton Coke Works — part of a sprawling industrial complex along the Monongahela River — took place just before 11 a.m. ET. Firefighters battled flames and heavy smoke that billowed out of the plant, which is owned by U.S. Steel, a subsidiary of Nippon Steel.

Initially, two people were reported missing. One person was found and transported to a local hospital, said Allegheny County Police Assistant Superintendent Victor Joseph at an afternoon briefing. The other individual remains missing, he said.

There was no word yet on a possible cause o

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