Together In Electric Dreams Giorgio Moroder/Philip Oakey
The police watchdog has revealed it hasn't been able to interview the 31 officers present at the shooting of Mark Duggan last August.
His death in Tottenham was followed by rioting in London and across England.
The Independent Police Complaints Commission is calling for new powers to force police to answer questions if they witness a fatal shooting by fellow officers.
Scotland Yard insists the officers have spoken to investigators.