Aug. 11 (UPI) -- At least one person is dead and several are injured, including those trapped in rubble, after an explosion at the U.S. Steel Clairton Coke Works about 15 miles southeast of Pittsburgh, officials said. Allegheny County Emergency Services spokesperson Kasey Reigner told WPXI-TV that "dozens were injured" in the blast. Also, two people are missing as crews searched for victims trapped in rubble. At 10:50 a.m. EDT, emergency medical services received a call for an "ongoing