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Curfews are in force in nearly 40 American cities -- including the capital, Washington -- on a sixth night of protests over the death of George Floyd, who was in police custody.

There have been confrontations between police and demonstrators in Atlanta, Philadelphia, San Diego and Los Angeles.

Tear gas has been used, police cars have been set on fire and shops have been looted. Derek Chauvin, the Minneapolis policeman accused of murdering George Floyd, is due in court for the first time today.

Here thousands of people gathered over the weekend in Trafalgar Square and at the American embassy in Battersea, London -

Dr Floyd Millen is a former adviser to the Metropolitan Police Authority and a Political Scientist with a PhD in Political Science and Criminology from Loughborough University. He told ´óÏó´«Ã½ Radio Leicester's Ben Jackson that the social contract between police and the public was broken.