Bomb dropped by U.S. in World War II explodes at airport in Japan, causing runway damage and cancellation of 80 flights CBS NewsBuried US second world war bomb explodes at Japanese airport The GuardianSuspected WWII bomb grounds Japanese airport Al Jazeera EnglishRunway closed at Japan airport after dud shell explodes on taxiway Kyodo News PlusRunway closed at southwest Japan airport after explosion on taxiway Nikkei Asia