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Sony hack 'national security matter' Sony hack: White House views attack as security issue
(34 minutes later)
Sony hack that forced cancellation of film release being treated as a national security matter, the White House says A cyber attack on Sony Pictures that forced the cancellation of a major film release is being treated as a national security matter, the White House says.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. Spokesman Josh Earnest said the US believed the hacking was the work of a "sophisticated actor" - but refused to confirm if North Korea was responsible.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. 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.
They later issued a warning to cinemas planning to screen The Interview.
Referring to the 9/11 terror attacks, they said "the world will be full of fear" if the film was screened.
The subsequent cancellation of the film's release has been criticised in Hollywood as an attack on freedom of expression.
At a White House briefing on Thursday, Mr Earnest said US officials had held daily discussions about the Sony cyber attack and were considering an "appropriate response".
However, he refused to comment on who was responsible, saying he did not wish to pre-empt an investigation by the Department of Justice and the FBI.