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    Riot police move in to quell a protest on a main street in London, late Friday, July 28, 2017. Protesters angry over the death of a young black man following a police chase have clashed with riot police in London, throwing bottles and fireworks and setting garbage cans on fire. (Lauren Hurley/PA Wire via AP)

    London rioters battle police

    A wave of violence and looting has raged across London since Saturday, as authorities struggled to contain the worst unrest since the 1980s.