An unexploded World War II bomb detonated at Miyazaki Airport in southwest Japan, damaging a runway and canceling over 80 flights, but causing no injuries. The explosion created a 23-foot-wide crater. The bomb, identified as a 500-pound American ordnance, was likely dropped during a WWII air raid. Miyazaki Airport, a former military airfield, has previously encountered unexploded ordnance. The airport is set to resume operations on Thursday. Unexploded bombs from WWII are common in Japan, with significant amounts still found, particularly in Okinawa.