Buried US second world war bomb explodes at Japanese airport The GuardianJapan Airport Closes After Suspected U.S. Bomb From World War II Explodes ForbesRunway closed at Japan airport after dud shell explodes on taxiway Kyodo News PlusSuspected WWII bomb grounds Japanese airport Al Jazeera EnglishU.S. Bomb From World War II Explodes at Japanese Airport, Over 80 Flights Canceled TIME