The United States has imposed new sanctions on North Korea as part of its first response to the cyber attack on Sony Pictures.
The FBI has blamed North Korea for the attack which leaked confidential data from Sony computers.
North Korea has denied the allegation but expressed fury over Sony's comedy The Interview, which features a plot to assassinate leader Kim Jong Un.
The Interview, the Sony Pictures film about a fictional plot to assassinate North Korean leader Kim Jong Un, opened in more than 300 cinemas across the United States on Christmas Day.
It drew sell-out audiences in many movie theatres, where punters said they were championing freedom of expression.
Seth Rogen, who co-stars in the low-budget comedy with James Franco, and co-director Evan Goldberg surprised moviegoers by appearing at a screening in Los Angeles.
ITV News' Rebecca Barry reports.
North Korea's dispute with the US over computer hacking took a new twist when the communist state lost Internet access for several hours.
A hacker group who claimed to be behind a cyber attack on Sony Pictures have posted a message online apparently mocking the FBI.
Events company Secret Cinema is planning to screen a film in protest at what they have called the 'censorship' of The Interview.