North Korea warned the United States of massive cyber attacks if the U.S. retaliates for a hacking attack on Sony, which Pyongyang denied orchestrating.

State media reported that North Korea would attack the so-called citadels of America, an offensive far more potent and disrupting than the Sony attack that resulted in the cancellation of the theater release of the movie, "The Interview."

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A report on the north's state-run KCNA said the government of supreme leader Kim Jong-un had launched the toughest cyber counterattack against the US, warning that it will be a gross miscalculation to think that a film production firm is the only target.

The government report added measures will be taken against the Pentagon, the White House and the U.S. mainland, which it called a terrorist "cesspool." It said the  group that claimed responsibility for hacking into Sony, the "Guardians of Peace," are preparing attacks not only in the continental U.S. but all over the globe.

North Korea had also accused the Obama administration of instigating the production of the film, "The Interview," citing "clear" evidence that proved it.

On Friday, the U.S Federal Bureau of Investigation identified North Korea as the source of the hacking attack against Sony.

Obama called the attack an act of cybervandalism, adding the U.S. will carefully weigh if North Korea should be put back on a list of terrorist-friendly states.

He said there are very clear indicators if and when a state is considered a sponsor of terrorism, pointing out that policy-makers do not make judgments merely based on the news. The U.S. leader said officials systematically checked what a state has and based on the findings, a decision will be made.

A plan for an attempt to assassinate Kim Jong-un is the core story of the comedy movie, "The Interview." On Friday, the CEO of Sony Entertainment Michael Lynton denied giving in to pressure from hackers and the studio was still looking at other ways to release the film.

TagsNorth Korea, sony hacking