Japan is trying to identify a submarine that was found just outside the country's territorial waters on Sunday.
A P3C patrol aircraft from Japan's Maritime Self-Defense Force detected the submarine near Kumejima Island of Okinawa prefecture in the East China Sea. It left the area by Monday morning traveling in the direction of the Pacific Ocean, Japanese media reported quoting a Defense Ministry statement.
Japan's southernmost Okinawa prefecture is home to two major U.S. military bases, including the Futenma air station.
The Ministry said another unidentified submarine was detected cruising west of Amami-oshima Island in Kagoshima prefecture on May 2.
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