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A South Korean coast guard ship found the boat south of the two Koreas’ eastern sea border on Tuesday morning, after a report by a fishing boat. The four people on board identified themselves as North Koreans, coast guard officials said.

South Korea’s military said it secured the custody of the North Koreans in coordination with the coast guard, after chasing their boat along the sea border. A military statement said the North Koreans were suspected of defecting to South Korea but gave no further details.

South Korean public broadcaster KBS, citing an unidentified government official, reported that the four North Koreans — a man and three women — are members of one family. KBS said they were not armed and did not wear military uniforms when they were found.

South Korea’s Unification Ministry declined to provide personal details of the four, saying an investigation was underway.

North Korea’s state media did not immediately report on the four North Koreans.

North Korean defectors are required to undergo questioning by South Korean authorities to determine whether their desire to resettle is genuine.

In 2019, South Korea deported two North Korean fishermen who said they wished to resettle, after determining they were criminals who had killed 16 fellow crew members. Earlier, several North Koreans were arrested after South Korean investigations concluded they were spies who had entered the country posing as defectors.

The 2019 deportation drew withering criticism by human rights groups, which argued that South Korea’s liberal government at the time had hurriedly expelled the fishermen in the hopes of improving ties with North Korea, after learning North Korean authorities were pursuing them.

Some past defections triggered tensions between the two Koreas. South Korea accepts those who choose to resettle in the South, but North Korea often says its people are held against their will in the South and demand they be returned.

If the four North Koreans found Tuesday are determined to be genuine defectors, it would be the second case of North Koreans fleeing to the South by sea this year. In May, nine defected by sea off the Korean Peninsula’s west coast, according to South Korea’s Unification Ministry.