TOKYO — Over the past two months, mysterious boats filled with decomposed bodies have been appearing in Japanese waters, and nobody is certain where they came from.

Between October and November this year, at least 11 boats were found drifting near Japanese territory in the the Sea of Japan. Some 25 corpses were recovered from the vessels, Japan's public broadcaster, NHK reported.

According to CNN, most of the boats were towed to Japanese ports, and many of the bodies remain unidentified. Media speculate the vessels are of North Korean origin.

Last month a boat found near Wajima had 10 corpses inside its hull, reported CNN. The vessel had writing on it that read "Korean People's Army" — the official name of North Korea's military.

Speculating as to why the boats are appearing, Maritime expert Yoshihiko Yamada told NHK they resemble those used by North Korean defectors, are made of wood and are heavy and slow. Others told NHK that the boats may be fishing vessels that strayed off course.

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