An as-yet-unseen documentary about Princess Diana is causing outrage for what it claims to show: a photograph of the late princess as she lay dying after her car crash in a Paris tunnel.

The film 'Unlawful Killing,' by actor and filmmaker Keith Allen, alleges that Diana predicted her own death by "accident" four years before it happened and that the royal family and other British officials have conspired in an elaborate cover-up.

The 90-minute film, which Allen calls "the inquest of the inquest," is reportedly backed by Mohammed Fayed, whose son Dodi also died in the infamous crash. British cinemas have refused to show the film due to its graphic content, but it will be screened this Friday at Cannes.

Watch the trailer for the film, which features interviews with Fayed and Piers Morgan, after the jump:

"Screening this film in Cannes for the world's media will be both exhilarating and terrifying for me," Allen tells the London newspaper The Guardian.

"[The movie] is not about a conspiracy before the crash, but a provable conspiracy after the crash," Allen says. "[It's] a conspiracy organized not by a single scheming arch-fiend, but collectively by the British establishment –- judges, lawyers, politicians, police chiefs, secret services, even newspaper editors."

Watch an ABC News report on the film below:

Do you believe there was a conspiracy surrounding Diana's death? And does the film have the right to show such a disturbing photo?

[via Huffington Post]