The initial investigation found that the South Korean spent six years in a country bordering North Korea using religion to disguise anti-North Korea espionage activities, the North's statement alleged. It said the investigation was intensifying, without elaborating.
Many South Korean missionaries work with North Korean defectors and border-crossers in China. Kenneth Bae, an American missionary and tour operator, was sentenced to 15 years of hard labor after being arrested for alleged hostile acts in North Korea a year ago. North Korea officially recognizes freedom of religion, but it tolerates only sanctioned churches, and activists and defectors call it one of the world's worst places for religion.
An official with South Korea's spy agency, the National Intelligence Service, speaking on condition of anonymity because of office rules, said the North was making "a ridiculous argument. It's groundless."
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AP writer Youkyung Lee contributed to this story from Seoul, South Korea.