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The divide separating police and citizenry in both societies, as well as the political cost of police violence, continue to expand. Why are citizens being killed rather being protected?
At the most extreme, some have called police killings of black people and retaliatory shootings of officers a new US civil war. In Dallas, Ines Pohl reports, mourners have tried to find meaning in a wave of violence.
Five police officers have been shot dead and several injured during protests in the US city of Dallas. Thousands have marched in cities across the United States after the fatal police shootings of two black men