Relatives and friends of people who died while in police custody have marched to Downing Street to demand justice for their loved ones.
The United Families and Friends group, which organised the event, said about 300 protesters took part in the annual procession, which started in Trafalgar Square and marched down Whitehall.
Activists carried placards which read "No Justice No Peace" and banners in memory of those such as musician Sean Rigg, who died after being restrained at Brixton police station, south London, in August 2008.
Deborah Coles, director for the Inquest campaign group, said the procession was an "important but poignant" day for the families.
She added: "Many families feel betrayed by a system that has let them down.The same issues repeat themselves time and again despite the empty platitudes from Government ministers that lessons will be learned."