Photographic stills from the unfinished second Harry Potter movie were reported stolen from the film's studios in Britain, police said Saturday.

The photos from Harry Potter and the Chamber of Secrets were missing from a locked room at Leavesden Studios, north of London, where the film is being shot.

The film's production company, Warner Bros., warned the media not to use the stolen pictures, but would not comment further.

Harry Potter and the Chamber of Secrets is the second of a projected seven films following the adventures of the boy wizard. It is scheduled for release in November.