By Jonathan Davies

Sony has condemned the "vicious" cyber attack which led to it suspending the release of The Interview.

Speaking at the Consumer Electronics Show (CES) in Las Vegas Sony boss Kazuo Hirai criticised the Guardians of Peace hackers.

Mr Hirai said he was proud of how the company stood up to the "extortionist" hackers.

"Both Sony, former employees and current employees were the victim of one of the most vicious and malicious cyber attacks in recent history," Mr Hirai said.

The hacks by the Guardians of Peace warned the public to 'remember 9/11' if they were to watch The Interview in cinemas.

The film tells a fictional tale of a plot to assassinate North Korea leader Kim Jong-Un.

Sony Entertainment Pictures withdrew the Christmas Day release, but soon reinstated a limited launch after widespread criticism.

"I have to say that I'm very proud of all the employees, and certainly the partners who stood up against the extortionist efforts of criminals, and worked tirelessly, sometimes for days on end to bring you The Interview," said Mr Hirai.

He added: "I have to say that freedom of speech, freedom of expression, freedom of association - those are very important lifelines for Sony and our entertainment business".

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