Los Angeles - The Warner Bros movie studio postponed until early next year the release of Gangster Squad, a crime drama featuring a scene with a movie theatre shooting that prompted concern following last Friday's fatal attack in Colorado.

The film, a mob thriller set in Los Angeles during the 1940s and 1950s, starring Sean Penn and Ryan Gosling, will reach theatres on January 11, 2013, rather than its originally scheduled September 7 debut, a Warner Bros spokesperson said on Thursday.

The studio is considering whether to edit or delete the scene in which mobsters burst through a movie screen while opening fire on a theatre audience, a person familiar with the studio's plans told reporters.

The Warner Bros spokesperson declined to comment on whether the movie will be changed.

The studio acted after a lone gunman shot and killed 12 people on July 20 during a midnight showing of the new Batman movie, The Dark Knight Rises - another Warner Bros release.

Just after the incident, Warner Bros pulled Gangster Squad promotional trailers that featured the shooting scene and were running ahead of The Dark Knight Rises in some theatres. - Reuters