U.S. Blames North Korea for Hack Attack Against Sony

President Obama wishes Sony had spoken to him before canceling release of "The Interview," says the US will respond.
3:38 | 12/20/14

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Transcript for U.S. Blames North Korea for Hack Attack Against Sony
But we begin with the growing outrage over Sony some say giving in to North Korea. And posters taken down, the movie, "The interview" pulled. Tonight, the new threat. What they want now. But first, the president, and what he said about them pulling the movie. Did they give into the hackers? I think they made a mistake. Imagine what they would start doing if there's a documentary or news report they don't like. Tonight, the hackers, what they're doing now. Here's Pierre Thomas. Reporter: Today the U.S. Government pointed the finger of blame directly at North Korea for the devastating cyber attack against Sony pictures. They caused a lot of damage and we will respond. We will respond proportionally and at a time and place we choose. Reporter: The extraordinary response coming after FBI investigators pieced together a trail of clues including Ip addresses apparently linked to Pyongyang. Lines of computer code used by north Korean hackers in the past and striking similarities between this attack and a series of devastating cyber attacks targeting south Korean banks and cell phones last year. You two are going to be in a room alone with Kim. Reporter: The unprecedented attack all because the north Koreans were angry about a movie depicting the assassination of their leader. Sony canceling that movie's Christmas release after the hackers threatened American movie Goers and theaters refused to show it. Sony's president telling CNN today his company had no choice. We have not caved. We have not given in. We have persevered and we have not backed down. Reporter: Today hackers took a victory lap, sending Sony a new message. Praising the company's very wise decision but threatening more mayhem if the film is ever released, distributed or leaked in any form. The masterminds likely part of a secretive north Korean spy unit called bureau 121 tasked with developing an army of so-called cyber warriors recruited as children and trained for years at this military school. Today one of Hollywood's leading men says the damage has already been done. Actor George Clooney, lashing out at his Hollywood colleagues, said when he went to industry heavyweights last week asking them to publicly support Sony no one would. This is how scared this industry has been made, Clooney told deadline.com. He added, we have allowed north Korea to dictate content. That is just insane. Pierre is with us live from Washington. They're going to try to get some version of this out now? Right, they're looking for some way to get people to see the film. Let's go to John Karl. What did the president say? He will take action against North Korea. His team is developing a range of options from new sanctions to some kind of a cyber counterattack. And he was asked if he would consider a military respond but officials say this is highly unlikely.

This transcript has been automatically generated and may not be 100% accurate.

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