OSAN AIR BASE, South Korea — Air Force safety experts were seeking answers Friday on why a U.S. fighter plane released a dummy bomb Wednesday that caused no injuries but ripped a jagged path through a South Korean wire factory. The nonexplosive training bomb sent startled workers scurrying at the two-story 3A Company Ltd. factory after it crashed through the roof and burrowed its way into a ground-floor office. The mishap occurred around 12:30 p.m. Wednesday in Eumseong, northern Chungcheong province. The bomb dropped from an A-10 attack plane assigned to the 25th Fighter Squadron, part of the 51st Fighter...