Fbi officials have confirmed North Korean leaders were behind the cyber hack attack that exposed Sony emails and leaked unreleased films and led to the cancellation of the release of Seth Rogen's new comedy The Interview.

In a statement released on Friday (19Dec14), a spokesman for the agency revealed an investigation into the cyberterrorism had been concluded - and all fingers pointed at North Korea.

The statement reads: "As a result of our investigation, and in close collaboration with other U.S. Government departments and agencies, the Fbi now has enough information to conclude that the North Korean government is responsible for these actions.

"While the need to protect sensitive sources and methods precludes us from sharing all of this information, our conclusion is based, in part, on similarities in specific lines of code, encryption algorithms, data deletion methods, and compromised networks.

"We are deeply concerned about the destructive nature of this attack on a private sector entity and the ordinary citizens who worked there... Further, North Korea's attack on Spe (Sony Pictures Entertainment) reaffirms that cyber threats pose one of the gravest national security dangers to the United States.

"North Korea's actions were intended to inflict significant harm on a U.S. business and suppress the right of American citizens to express themselves. Such acts of intimidation fall outside the bounds of acceptable state behavior."

Meanwhile, USA Today reports Sony executives received a message from the hackers, calling themselves Guardians of Peace, behind the security breach on Thursday night (18Dec14), insisting they had made a "very wise" decision by cancelling the Christmas Day release of The Interview, which features Rogen and James Franco as hapless Tv journalists assigned to assassinate North Korean leader Kim Jong-un.

The hackers' message read: "Now we want you never let the movie released (sic), distributed or leaked in any form of, for instance, Dvd or piracy, and we want everything related to the movie, including its trailers, as well as its full version down from any website hosting them immediately (sic)."

Meanwhile, in his end of year news conference, U.S. leader Barack Obama told reporters at The White House he thought Sony bosses "made a mistake" in pulling The Interview from cinemas, adding, "We cannot have a society in which some dictator some place can start imposing censorship here in the United States, because if somebody is able to intimidate folks out of releasing a satirical movie, imagine what they start doing when they see a documentary they don't like, or a news report they don't like."