The explosion, followed by several smaller blasts, could be felt in the nearby community and prompted county officials to warn residents to stay away from the scene so emergency workers could respond.

The explosion rocked the Clairton Coke Works, about 10 miles south of downtown Pittsburgh and one of four U.S. Steel plants in PA.

Multiple explosions at a steel plant near Pittsburgh have killed two people and left 10 others injured on Monday, according to authorities. Video captured a massive black plume of smoke rising from the U.