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A cyber attack on Sony Pictures that forced the cancellation of a major film release is being seen as a serious national security matter, the US says.

A White House spokesman said the US believed the hacking was the work of a "sophisticated actor" - but refused to confirm if North Korea was responsible.

Sony withdrew The Interview, a new comedy film about North Korea's leader, after threats from hackers. Hackers have already released sensitive information stored on Sony computers.

Alonso Duralde, film reviews editor at the entertainment news website The Wrap, was among the first to see the film. He's told Phil Williams what it's like, and why he thinks others will see it sooner rather than later.

This clip is originally from Phil Williams on Thursday 18 December 2014