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The White House and U.S. intelligence officials are standing by their assertion that North Korea was behind the cyber attack against Sony–despite evidence presented by outside experts this week that calls that into question, and in some cases implicates a former employee of the studio.
So what makes the FBI so sure North Korea was responsible? CNN's Pamela Brown reports.
The U.S. fires back against North Korea, announcing President Obama has authorized additional sanctions in response to the North Korean regime's "ongoing provocative, destabilizing, and repressive actions and policies, particularly its destructive and coercive cyber attack on Sony Pictures Entertainment."