Workers were heating coal when deadly explosion rocked Pennsylvania steel plant

CLAIRTON, Pa. (AP) — Workers were heating coal into a key component of steelmaking and preparing for maintenance when an explosion rocked a U.S. Steel plant outside Pittsburgh , a company executive said Tuesday, a day after the blast killed two workers.

The explosion , which was powerful enough to shake nearby homes, injured more than 10 other steelworkers, including one who spent hours trapped in rubble. It also knocked down a wall, scorched a pickup truck and sent a huge plume of black smoke into the air.