Sean Penn has joined President Barack Obama in blasting Sony executives for bowing to cyberterrorists' threats and pulling the Christmas Day (25Dec14) release of Seth Rogen's comedy The Interview.

Hackers calling themselves Guardians of Peace threatened to attack cinemas screening the movie, in which Rogen and James Franco play hapless Tv journalists assigned to assassinate North Korean leader Kim Jong-un, following a month of Sony database security breaches.

The studio bosses pulled the film from release on Wednesday (17Dec14) after the owners of America's leading cinema chains opted not to show the comedy for fear of repercussions.

On Friday (19Dec14), President Obama attacked the Sony bosses in his end of year press conference at The White House, telling reporters the executives had "made a mistake" in cancelling the release of The Interview.

And shortly afterwards, Penn released a statement, addressing the controversy.

The Oscar winner fears that, in bowing to the threats, Sony bosses have opened the doors for other terrorist groups.

He writes, "This week, the distributors who wouldn't show The Interview and Sony have sent (terrorist group) Isis a commanding invitation. I believe Isis will accept the invitation. Pandora’s box is officially open.

"The damage we do to ourselves typically outweighs the harm caused by outside threats or actions. Then by caving to the outside threat, we make our nightmares real. The decision to pull The Interview is historic. It’s a case of putting short term interests ahead of the long term.

"If we don’t get the world on board to see that this is a game changer, if this hacking doesn’t frighten the Chinese and the Russians, we're in for a very different world, a very different country, community, and a very different culture."

Fbi officials have confirmed the hack attack on Sony is linked to the North Korean regime.