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Dallas Attack: How the Deadly Police Ambush Unfolded
July 8, 201603:57

    Nightly News

    Dallas Attack: How the Deadly Police Ambush Unfolded

    03:57

    A law enforcement source tells NBC station KXAS that the gunman, who shot 12 officers, was laughing and singing before police killed him with a bomb on a robot.July 8, 2016

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