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". The film's advance publicity note hints at a cover-up, saying: "We the people demand that the government revisit and initiate a thorough and independent investigation to the tragic events of 911." Details of the film ... are expected to be revealed at an American Film Market conference in Los Angeles next week. 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. Until now Hollywood has steered clear of claims that the Bush administration, or other elements in the government, may have been behind the 9/11 attacks. "September Morn" has assembled a cast linked to the [9/11 truth] movement, which alleges official inconsistencies, complicity and cover-up. Sheen, who starred in "Apocalypse Now" and television's "The West Wing", has long questioned whether Islamist hijackers single-handedly brought down the Twin Towers. He said: "However, there have been so many revelations that now I have my doubts, and chief among them is Building 7 - how did they rig that building so that it came down on the evening of the day?"