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Mourners hold candles aloft during a "Dallas Strong" vigil outside City Hall in Dallas, Texas, on July 11, 2016, held in honor of the five police officers killed in the recent sniper attack. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)

Mourners hold candles aloft during a "Dallas Strong" vigil outside City Hall in Dallas, Texas, on July 11, 2016, held in honor of the five police officers killed in the recent sniper attack. / AFP / Laura Buckman        (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)