Demonstrators hold up flares in Parliament Square during a Black Lives Matter protest in London, following the death of George Floyd who died in police custody in Minneapolis, London, Britain, June 7, 2020. Tens of thousands took to the streets of London on Sunday, rallying for a second day running to condemn police brutality after the killing of George Floyd in Minneapolis, with some wearing face masks bearing the slogan "Racism is a virus". REUTERS/Dylan Martinez

A demonstrator with a megaphone on Whitehall during a Black Lives Matter protest in London, following the death of George Floyd who died in police custody in Minneapolis, London, Britain, June 7, 2020. On Saturday, thousands gathered in central London in a demonstration that was peaceful but ended with small numbers of people clashing with mounted police near Prime Minister Boris Johnson's Downing Street residence. REUTERS/Hannah McKay

A woman takes a knee during a Black Lives Matter protest in London, following the death of George Floyd who died in police custody in Minneapolis, London, Britain, June 7, 2020. London police chief Cressida Dick said 27 officers had been injured in "shocking and completely unacceptable" assaults during anti-racism protests over the past week, including 14 on Saturday. Two were seriously hurt and an officer who fell from her horse underwent surgery. REUTERS/Hannah McKay

A woman stands in front of police officers during a Black Lives Matter protest in London, following the death of George Floyd who died in police custody in Minneapolis, London, Britain, June 7, 2020. Tens of thousands took to the streets of London on Sunday, rallying for a second day running to condemn police brutality after the killing of George Floyd in Minneapolis, with some wearing face masks bearing the slogan "Racism is a virus". REUTERS/Dylan Martinez

Demonstrators with hold signs on Whitehall during a Black Lives Matter protest in London, following the death of George Floyd who died in police custody in Minneapolis, London, Britain, June 7, 2020. Tens of thousands took to the streets of London on Sunday, rallying for a second day running to condemn police brutality after the killing of George Floyd in Minneapolis, with some wearing face masks bearing the slogan "Racism is a virus". REUTERS/Hannah McKay

Police clash with demonstrators during a Black Lives Matter protest in London, following the death of George Floyd who died in police custody in Minneapolis, London, Britain, June 7, 2020. Tens of thousands took to the streets of London on Sunday, rallying for a second day running to condemn police brutality after the killing of George Floyd in Minneapolis, with some wearing face masks bearing the slogan "Racism is a virus". REUTERS/Hannah McKay