Hollywood is to court controversy with a film that will challenge the official version of the events of 9/11, a previously taboo topic for the industry mainstream. Martin Sheen, Woody Harrelson and Ed Asner, who have all supported conspiracy theories about the terrorist attacks, have signed up to the movie, which is entitled September Morn.

Styling itself as a drama in the tradition of Twelve Angry Men, the film's advance publicity note hints at a cover-up, saying: "We the people demand that the government revisit and initiates a thorough and independent investigation to the tragic events of 911."

Details of the film, which is to be directed by BJ Davis and written by Howard Cohen, are expected to be revealed at an American Film Market conference in Los Angeles next week, Deadline.com reported.

The production has been set up by Fleur de Lis Film Studios, which has also made the documentary A Noble Lie, about the Oklahoma City bombing, and Operation: Dark Heart, a feature based on an intelligence agent's memoirs.