An explosion at a U.S. Steel plant south of Pittsburgh has killed two people and injured 10 others. One worker was rescued from the smoldering wreckage hours after Monday’s blast at Clairton Coke Works.

“It is with profound sadness that I share with you that the U. S. Steel colleague who had been unaccounted for has been located and confirmed deceased, following an extensive search and rescue effort," David Burritt, the company's CEO, said in a statement. At least 10 people were injured in the blast, officials said.