An unexploded US World War II bomb that had been 'buried' at a Japanese airport exploded on Wednesday, leaving a large crater on the runway and canceling more than 80 flights but causing no injuries, Japanese officials said.
Land and Transport Ministry officials said there were no planes nearby when the bomb exploded at Miyazaki Airport in southwestern Japan.
Officials said an investigation by security forces and police confirmed the explosion was caused by a 500kg US bomb. They are investigating what caused the sudden explosion of the bomb.
Videos broadcast on Japanese television showed a crater on the runway, said to be about 7 meters in diameter and 1 meter deep.
World War II bomb explodes on a taxiway at Miyazaki Airport in southwestern Japan forcing the closure of its runway.
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The transport ministry said its officials found a hole with a diameter of 7 meters and a depth of 1 meter on the taxiway after an explosion was heard around 8 am... pic.twitter.com/eFYXPx2ri7
Chief Cabinet Secretary Yoshimasa Hayashi said more than 80 flights had been canceled at the airport.
Miyazaki Airport was built in 1943 as a flight training ground for the Imperial Japanese Navy, from which several kamikaze pilots took off on suicide attack missions.
Several unexploded bombs dropped by the US military during World War II have been discovered in the area, Defense Department officials said.
Hundreds of tons of unexploded bombs from the war remain buried across Japan and are sometimes discovered on construction sites.