Some cinemas in the US, which are showing the controversial film "The Interview", say they're going to tighten security.

The comedy, about the fictional assassination of North Korea's leader, is out today in America, despite Sony Pictures initially scrapping its release when hackers threatened to attack cinemas who showed it.

These moviegoers in New York have bought tickets:

Sony have also announced their video-on-demand (VOD) plans for the film.

In a statement, the company said the film will be available to rent or buy on Google Play, YouTube Movies, Microsoft’s Xbox Video and the dedicated website http://www.seetheinterview.com.

The White House praised Sony for reversing its decision to pull The Interview, which features a fictional assassination of North Korea's leader.

The initial cancellation came following the cyber attack against Sony, which the US blames on North Korea, and threats of violence against cinemas screening the film.

The hackers also obtained and released sensitive internal emails involving senior executives at Sony Pictures.

Sony claimed it had had "no choice" but to cancel the release because cinema chains across the US had backed away from showing the film after the threats.

North Korea has denied being behind the attack. However, Mr Obama said America would "respond" to the hacking.