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South Korea has said it believes at least four suspects are North Korean spies.
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A North Korean spy was convicted by a South Korean court for planting a bomb.
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There's a North Korean spy van headed from the Dragon Hill to the main gate.
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A South Korean spy agency initially said the death was part of the leader's five-year plot.
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Cho was decorated for catching a North Korean spy in 1995 in a small town southwest of Seoul.
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Its state media often denounces them as "human scum" and accuses South Korean spies of kidnapping some of them.
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Separately, North Korea said on November 7 that it had arrested a South Korean spy, but it has not provided any more details.
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US secretary of state Mike Pompeo is expected to meet former North Korean spy chief Kim Yong-chol at a Washington hotel on Friday.
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A North Korean spy jailed by South Korea in 2012 is said to have admitted trying to organise a hit-and-run accident targeting him.
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Later he will hold talks with Abe and meet relatives of Japanese citizens who were abducted by North Korean spies during the cold war.
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Hyon-hui says she was tutored by a woman who is among several Japanese abducted by North Korean spies at the height of the cold war.
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Dec. 18, 1998 - South Korean navy sinks a submersible North Korean spy vessel on east coast of the peninsula.
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After the body of a suspected North Korean spy was found on a beach on Sunday, commando units combed the north-eastern coast for more infiltrators.
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In one 1967 incident, South Korea's then-Central Intelligence Agency said North Korean spies had attempted to suborn 194 South Koreans in Germany.
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Her absence comes as South Korean spies revealed that she now serves as his "de facto second-in-command," though she has not been designated his successor.