When the device went off at Miyazaki Airport in southwest Japan, no aircraft was in the area, and no injuries were recorded, according to officials from the Land and Transport Ministry.
Investigators found that the explosion originated from a 500-pound bomb from World War II, but they are unsure of what precipitated the explosive blast.
When Miyazaki Airport was constructed in 1943, it served as a former aviation training facility for the Imperial Japanese Navy, from which some kamikaze pilots launched their suicide assaults.
A neighboring aviation school captured footage of the explosion showing fragments of asphalt shooting skyward like a fountain. videos aired on it.
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Over 80 flights were canceled at the international airport, according to Chief Cabinet Secretary Yoshimasa Hayashi. The airport plans to open again on Thursday morning.
