The badly decomposed remains of another man were discovered around 15 metres (50 feet) from the boat, added Abe.

“It is difficult to identify the bodies as they had begun to decompose,” he said, noting that rough seas had prevented officials from investigating the boat thoroughly.

“We spotted a tobacco box which carries some Korean letters, but we can’t confirm the boat came from North Korea,” he said.

However, coastguard officials believe it is the latest North Korean fishing vessel to wash up on the coast, following a record number of such cases last year.

Television footage showed the wreckage of the flat-bottomed vessel capsized on the beach.

According to TV Asahi, a badge depicting former North Korean leader Kim Jong Il was found in the wreckage.

The number of North Korean fishing vessels washing up on Japan’s coast hit a record 104 cases last year, following 66 in 2016, according to the Japanese coastguard.

Sometimes the crew members have already died at sea, a phenomenon local media refer to as “ghost ships”.

Experts say some North Korean fishermen are travelling further out to sea in order to satisfy government mandates for bigger catches.

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