The story behind the death of a musician in police custody has been made into a documentary film.

Who Polices the Police? premiered at the 2012 West Midlands Human Rights Film Festival in Birmingham on Wednesday.

It is also being screened today (October 5) at London's Garden Court Chambers at 6pm.

The film explores the circumstances behind Sean Rigg's death in the custody area of Brixton Police Station, shortly after the 40-year-old was arrested in Weir Road, Balham.

It is the brainchild of media production lecturer Ken Fero, with the film looking at the investigation by the Independent Police Complaints Commission (IPCC) after Mr Rigg's death.

Earlier this year a jury inquest found police officers used "unsuitable force" when restraining Mr Rigg, who suffered from schizophrenia.

The documentary was filmed over a period of four years and lasts for 52 minutes.

Mr Fero said: "It’s entirely appropriate that this new documentary should be having its premiere at a film festival dedicated to cinema which explores current and contemporary human rights issues from around the world.

"It’s a highly critical piece targeting the police self-investigation and elements of the state, as well as popular media.

"The film moves from highly-emotional vérité-style cinematography to comments by Chairman Mao and George Orwell. It also contains some disturbing CCTV footage of Sean Rigg’s death."