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North Korea reacts after FBI announced the country was behind Sony hacking scandal. They insist they are not the culprit and demand joint probe with the United States on the cyber attack, adding that there would be "grave consequences" if the White House didn't comply.

"As the United States is spreading groundless allegations and slandering us, we propose a joint investigation into this incident," the country's officials say as quoted by Korean Central News Agency (KCNA). "Without resorting to such means of torture as were used by the CIA, we have no means to prove this incident had nothing to do with us."

The cyber attack against Sony took a sinister twist as the hackers known as Guardians of Peace vowed a 9/11-style terror if the studio moved forward with the release of comedy "The Interview" which features the assassination of North Korean leader Kim Jong-Un. Although the Asian country denied any involvement in the hack, they applauded it as "a righteous deed."

The satirical film starring Seth Rogen and James Franco has since been canceled by Sony, which provoked criticism from President Obama. "We cannot have a society in which some dictator someplace can start imposing censorship here in the United States, because if somebody is able to intimidate folks after releasing a satirical movie, imagine what they start doing when they see a documentary they don't like, or news reports they don't like," he said. In response, the studio said they had no choice.

Meanwhile, the FBI declaration that North Korea was responsible for the hack sparked skepticism from Evan Goldberg, who directed "The Interview" with Rogen. He believed it was an inside job. "My gut instinct was, 'Oh no, is it the North Koreans?' " he told Straight.com. "For two seconds it was the North Koreans, and then the younger guys in our office who know way more about computers were, like, 'No way. You'd have to know Sony's network, it has to be somebody on the inside.' "