North Korea Offline After Sony Hacking

Massive Internet blackout for North Korea; U.S. not commenting.
1:41 | 12/23/14

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Transcript for North Korea Offline After Sony Hacking
and to a major development in North Korea. Just days after president Obama said North Korea was behind that giant Hollywood hack attack. Something has now happened in North Korea. So, who is behind it? Here's ABC's Tom llamas tonight. Reporter: Tonight, North Korea facing a widespread internet collapse. The worst in years. The loss of service comes four days after president Obama blamed North Korea for the Sony cyber attack, vowing a proportional response. If the U.S. Did this, they're clearly defining what the program terps are for this type of activity. Not only North Korea, but other nation states participate in this type of activity, there are going to be repercussions. Reporter: On state TV, north Korea now threatening an attack on the U.S. If there isn't a joint investigation to prove North Korea did not hack into Sony's computers. If they want to help here, they can admit their culpability and compensate Sony for the damages that they caused. Reporter: And Sony is dealing with a new problem. You want to go kill Kim jong-un? Totally. Reporter: Theater owners reportedly fuming at the film studio for blaming them for not releasing the movie "The interview." The movie theaters came to us one by one over the course of a very short period of time. We were completely surprised by it. And announced that they would not carry the movie. Reporter: ABC news learning Sony's CEO had to reach out to the major theater chains after those comments and say he did not mean theaters were wholly responsible. This was something today. Tom with us now. And who do we think is behind this? Reporter: Government sources and cyber security experts tell us that hacking to north core reel Ya's system is not incredibly difficult. If the U.S. Did do it, they're not talking about it. Tom llamas, great to have us with us here tonight. We're going to turn overseas

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

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