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.

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.

A regional airport in Japan closed on Wednesday after an undetonated bomb likely dropped by the U.S. in World War II exploded, canceling dozens of flights though causing no injuries, Japanese officials said, as hundreds of unexploded explosives remain buried throughout the country.