The Clairton Coke Works is considered the largest coking operation in North America and one of four major U.S. Steel plants in Pennsylvania.

• There has been an explosion at the Clairton Coke Works Steel Plant in Pittsburgh, Pennsylvania. • Dozens are hurt – and people are trapped under rubble, the Associated Press reported. Video captured the moment the explosion took place and smoke followed at a US Steel coking plant near Pittsburgh on Monday morning.