Japan’s Coast Guard found the body of a male and parts of a wooden boat suspected to be from North Korea on the coast of one of Japan’s outlying islands on Saturday, an official said.

Axar.az reports citing Reuters that, the Coast Guard made the discovery around 6:30 a.m. on Saturday (2130 GMT on Friday) on Sado island, which is off the coast of Japan’s northwestern prefecture of Niigata, a coast guard official said, declining to give his name.

The guard also found a pack of cigarettes written in Korean and other personal belongings with Korean written on them near the body, the official said.

The cause of death is still unknown, the official said.

The discovery on Saturday marks the second time this month that parts of a wooden boat suspected to be from North Korea have washed up on the shores of Sado island, the official said.

Finding the body will add to the increasing unease in Japan and South Korea over North Korea’s nuclear arms program after U.S. President Donald Trump redesignated North Korea a state sponsor of terrorism, allowing the U.S. government to levy additional sanctions.

On Friday, police found eight North Korean men near a boat at a seaside marina in northern Japan. The men appeared to be fishermen whose boat had trouble, rather than defectors, the police said.

Last week, the Coast Guard rescued three North Korean men on a capsized boat in the Sea of Japan who said they were fishermen and were later sent home aboard a North Korean vessel.

A North Korean soldier dramatically defected to South Korea last week after being shot and wounded by his country’s military as he dashed across the heavily guarded Demilitarized Zone between the two countries.