article_snippet: (South Korea's has arrested what South Korea's claims are two spies who worked for South Korea's intelligence service, a North Korean official said Thursday on condition of anonymity.
article_snippet: a North Korean official said Kim had made a declaration of guilt.
article_snippet: CNN cannot confirm the authenticity of a declaration of guilt or whether, if Kim made one, it was made under duress.
article_snippet: South Korea's National Intelligence Service told CNN that "the information you've obtained is not true."
article_snippet: "We don't have any information that members of NIS were arrested in South Korea," an NIS representative said.
highlights_snippet: South Korea's National Intelligence Service denies claim .