The first 36 minutes of Harry Potter and the Deathly Hallows: Part 1 was leaked online yesterday morning and thousands of fans scrambled to get to the footage before it disappeared. Though the movie officially opens Friday, Warner Bros. gave out passes to lucky fans to see it earlier this week. Everyone who entered a preview screening was searched on the way in with a metal detector and a pat down. Though the source of the leak is still unknown, it'll be interesting to find out if the leak was through a fan with a video camera or an inside job. "This constitutes a serious breach of copyright violation and theft of Warner Bros. property," Warner Bros. told The Hollywood Reporter in a statement. "We are working actively to restrict and/or remove copies that may be available. Also, we are vigorously investigating this matter and will prosecute those involved to the full extent of the law." The previous instalment, Harry Potter and the Half-Blood Prince, was one of the most-pirated movies last year, with more than eight million illegal downloads.