An unexploded U.S. bomb from World War II that had been buried at a Japanese airport has exploded, causing a large crater in a taxiway and the cancellation of more than 80 flights but no injuries.

The explosion of a World War II-era bomb at a Japanese airport this week has prompted the government to do a wider search for other possible unexploded bombs at airports that were targeted during the conflict.

MIYAZAKI—Dangerous reminders of Miyazaki Airport's past as a former Imperial Japanese Navy air base during World War II continue to resurface in the unexploded ordnance that remains beneath the surface.