Flower, cards, balloons, and candles pile on top of police cruisers outside the Police Headquarters memorial for officers killed in the recent sniper attack in Dallas, Texas on July 10, 2016. The gunman who opened fire on Dallas officers during a protest against US police brutality, leaving five dead and seven others wounded, told negotiators he wanted to kill white cops, the city's police chief said July 8. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
