The IPCC said the three arrested were a 50-year-old sergeant who was arrested at work, a 29-year-old Pc arrested at an address in south London and a retired PC aged 48 who was arrested by appointment at a central London police station.
Sean Rigg died from a cardiac arrest at Brixton police station in August 2008 and the inquest jury found that police officers used "unsuitable" force after arresting the 40-year-old schizophrenic for attacking passers-by and police officers in Balham, south London.
More top news
After flooding and thunderstorms, a quieter night ahead
Boris Johnson announces funds for troubled country in a bid to stop an influx of illegal migrants and terrorists taking advantage of chaos.
The former US Presidential candidate says her "skin crawled" during her infamous second TV debate with Donald Trump in a new memoir.