By Daniel Hunter

Sony Pictures Entertainment was forced to shut down its computer system on Monday, according to reports, after it was targeted by hackers.

Various report said a skull appeared on computer screens linked to the system, with demands to release "secrets" if undisclosed demands weren't met. The message read alongside "#GOP", which suggests a group called Guardians of Peace made the attack.

Sony said it was investigating the "IT matter" after having shut down the system.

A anonymous user posted on Reddit the message that is believed to have appeared on Sony screens. It read: "Warning: We've already warned you, and this is just the beginning… We have obtained all your internal data including secrets and top secrets."

It comes months after the Sony Playstation Network was forced to shut down after a cyber attack in August.

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