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The NIS didn't say whether the stolen messages include any sensitive information.

Seoul has accused Pyongyang of launching other similar cyber attacks in recent years. Pyongyang has denied the allegations.

Animosities between the rival Korea have risen since North Korea's nuclear test and long-range rocket launch earlier this year.

Furious over harsh new U.N. sanctions and the biggest-ever South Korea-U.S. military drills, North Korea has fired short-range missiles and artillery into the sea and vowed to expand its nuclear arsenal. On Friday, North Korea's state media quoted leader Kim Jon UN as having ordered more nuclear explosion tests but it didn't say when they would be conducted