Eight bodies were discovered in a wooden 7-meter boat that washed ashore in Oga, Akita Prefecture, on the Sea of Japan coast facing North Korea, the Japan Coast Guard said Monday.

A cigarette pack bearing Hangul characters has been discovered from the boat, which suggests that it came from the North, Kyodo News quoted sources as saying.

The grisly discovery came just four days after eight men, believed to be North Koreans, were found drifting in a 20-meter fishing boat off the coast of Yurihonjo, also in Akita, on Thursday.