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Several U.S. law enforcement agencies are investigating whether North Korea is behind the recent hacking of Sony Pictures' online networks and the illegal dissemination of at least five of the company's films, a senior U.S. official confirmed to NBC News.

There has been speculation that the cyberattack could be linked to an upcoming Sony Pictures film called "The Interview," a comedy that features a CIA plot to assassinate North Korean leader Kim Jong-un.

The comedy starring Seth Rogen and James Franco is scheduled for release December 25. A North Korean official blasted the film as a symbol of the "desperation" of American society in an interview with British newspaper The Telegraph.

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Classified briefings to several U.S. agencies name North Korea among possible suspected perpetrators.

Attackers using the name Guardians of Peace, or G.O.P., have claimed responsibility for the hack of Sony Pictures' internal network. The attack began November 24, when employees' computers were reportedly plastered with messages bearing the phrase "Hacked by #GOP."

Apparently Kim Jong Un plans on watching #TheInterview. I hope he likes it!! http://t.co/5VrsgYlydE — Seth Rogen (@Sethrogen) June 20, 2014

It's unclear how widespread the attack is, but emails to multiple Sony employees last week could not be delivered.

Digital copies of unreleased Sony films "Annie," "Mr. Turner," "Still Alice" and "To Write Love on Her Arms" -- as well as the war movie "Fury," which is currently playing in theaters -- appeared online November 27. Later that day, a person claiming to be "the boss of G.O.P." emailed reporters with links to purported stolen internal data.

"We have much more interesting data than you know," the person wrote.