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The FBI says the North Korean government is responsible for the massive cyber attack on Sony.  A news release from the Justice Department says tools used in the Sony attack have "similarities to a cyber attack in March of last year against South Korean banks and media outlets, which was carried out by North Korea."  The release notes that cyber threats pose one of the gravest national security dangers to the U.S. 

The cyber attacks were related to Sony's pending release of the movie "The Interview," which depicts an assassination plot against North Korean leader Kim Jong-Un.  The hackers threatened severe repercussions if the movie was released.  This week, Sony pulled "The Interview" from a planned Christmas release after major theater chains refused to run it. 

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