(CNN) Seven bodies were found on the remnants of a wooden boat which has washed onto the shores of the Japanese island Sado, Japanese public broadcaster NHK reported.

A police officer made the gruesome discovery on Friday. After a thorough search by law enforcement and the Coast Guard, two decapitated heads were found on the boat.

7 bodies found in boat believed from N.Korea https://t.co/c4qnQTUlz3 — NHK WORLD News (@NHKWORLD_News) December 28, 2019

The boat measured approximately 7.6 meters (24.9 feet) long, 4.3 meters (14 feet) wide and 2 meters (6.5 feet) high. The discovered bodies were "partially skeletonized," according to NHK.

The ghost ship is believed to have come from North Korea as the sides was covered in Korean numbers and letters in red paint.

These ghost ships are nothing new. For years, North Korean boats, dubbed " ghost ships ," have been washing up on Japanese shores.

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