 The film premiered on October 6, 2009 at the Sitges Film Festival, where it won "Best Special Effects" and was in the running for "Best Film", and was part of the 2010 Sundance Film Festival in Park City, Utah.After a bidding war with Apparition, The Weinstein Company, Newmarket Films, First Look Studios, Samuel Goldwyn Films, and Sony Pictures Worldwide Acquisitions, Dark Castle Entertainment purchased the U.S rights to the film and the worldwide rights to any possible sequels in February 2010, thinking they "found "the next Paranormal Activity"".The film received a wide release in the United States on June 4, 2010, with Warner Bros. as distributor.