Three US military helicopters made emergency landing on Sunday by the side of a river in Wakayama Prefecture in western Japan, local media reported.
A local defence bureau notified the Wakayama prefectural government that the US military helicopters had landed on the riverside in Hashimoto on Sunday morning, Kyodo News said, citing local authorities.
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The report said that the helicopters later took off from the site in Hashimoto, Xinhua news agency reported.
It is believed that one of the aircraft had suffered a malfunction, according to the fire department.