Tonight, the Sony cyber attackers issuing new threats, now suggesting they'll take revenge on movie here theaters slated to play "The interview." What started at Hollywood gossip turning into a... See More
Tonight, the Sony cyber attackers issuing new threats, now suggesting they'll take revenge on movie here theaters slated to play "The interview." What started at Hollywood gossip turning into a possible terror threat. Just how credible is the threat? Here's ABC's Cecilia Vega. Reporter: From a corporation under siege to a nation potentially under attack. Today, hackers claiming they broke into Sony's computer network issuing their most ominous warning yet. A threat invoking 9/11, imflipping attacks at theaters plank to show "The interview," that Seth rogen and James Franco comedy about journalists attempting to assassinate Kim jong-un. You want us to kill the leader of North Korea? Yes. What? Reporter: The group claiming responsibility for the hack calling itselves guardians of peace, saying online, we recommend to keep yourself distant. If your house is nearby, you'd better leave. Promising, soon, all the world will see what an awful movie Sony has made. The world will be full of fear. And now, tonight, Sony apparently backing down. Telling theater owners they are free not to run the $44 million feature. You want to go kill Kim jong-un? Totally. It's a date. Reporter: Sony not commenting on the latest threat. But the movie's STA canceled a press tour in the wake of today's message. Seth rogen and James Franco earlier this week telling ABC's George stephanopoulos they stand by their comedy. Any second thoughts at all? At this point, it's too late to have any, really. I mean, no, I mean, I think, again, I like the movie. I can't in my head overconnect everything surrounding it with the movie itself. We set out to make a movie that was really entertaining to audiences and I genuinely think we did that and that's where my job ends. Reporter: What started with the cyber breach now elevated to an issue of national security. The FBI is investigating. The department of homeland security says, "At this time, there is no credible initem jetel Vince to indicate an active plot against mu view theaters in the United States." The threat appears to be menacing. It appears to be a continuation of the cyber attack against Sony as opposed to a credible, legitimate threat of physical harm. Reporter: It has been one taunt after the next from hackers diving into the deep recesses of Sony's computer networks. Data like social security Numbers and salaries released in batches. Now out there for the world to see. The name's bond. James bond. Reporter: An early version of the top secret script to the newest 007 movie. Stolen just as filming is set to begin. ? It's a hard knock life for you ? Reporter: And movies like "Annie" not yet in theaters. Then, the e-mails. No celebrity seemed to escape. Two of the top producers in Hollywood forced to apologize. Scott Rudin and Amy Pascal reportedly caught bashing Angelina Jolie, saying she lacked talent and had an ego. The pair even making racial jokes about president Obama, saying he might like the movie "Django unchained" or "12 years a slave." Brad Pitt leading the backlash, speaking out to access Hollywood. Someone's conversation in e-mail or in person should be private. Well, this has been an unpul unprecedented attack. Nothing like this has ever happened before. Reporter: And could it be behind it all, North Korea? North Korean government website called "The interview" an evil act of provocation and one south Korean think tank claims the hermit nation has a team of hackers capable of the attack. Sony is in a no-win situation. If they pull the movie, they are seen as kowtowing to bullies. If they don't pull the movie, then, and if something does happen, they're putting lives at risk. Reporter: But can Hollywood be bullied? Hollywood has caved from fresh from outside group claiming offense or sensitivities. In the 2012 remake of "Red dawn." Chinese villains were replaced with north Koreans after angry editorials appeared in Chinese newspapers. Following worldwide riots, south park creator saw an opportunity for satire -- A cartoon is about to air on American television with -- with the Muslim prophet Mohammed as a character. Reporter: But comedy central balked, sensoring the prophet's image. And in one of the most controversial films in recent years, "The passion of the Christ," 20th century fox passed on tis distribution rights. Controversy like this can help the buzz of a movie, but in this case now, turning the corner and now a lot of people are afraid to go. I've talked to many people today who are now second-guessing themselves if they should be going to screenings of this movie. Reporter: The hack already hitting Sony where it hurts, in the wallet. Sony stock down 10% in the last two weeks. Some analysts say they could spend millions in the fallout. And today, the first lawsuit. One class action suit by two former employees, claiming Sony failed to protect confidential information, calling it an epic nightmare, much better suited to a cinematic thriller than to real life. Hackers are not going anywhere. The stakes are higher now. There's more to gain. And we fully expect to see a continuing targeting of organizations all over the world. Reporter: It's being called the most massive corporate cyber attack ever and there could still be more to come. The hackers promising this is just the first part of a gift they'll deliver just in time for Christmas. For "Nightline," I'm Cecilia Vega in Los Angeles.
This transcript has been automatically generated and may not be 100% accurate.