By Weiyi Cai, Crista Chapman, Tara Godvin, Juliette Love, Bill Marsh, Jugal K. Patel, Yuliya Parshina-Kottas and Joe Ward
Thousands have taken to the streets to express their anger over racism and police violence. Some of the demonstrations have turned violent, prompting the activation of the National Guard in at least 21 states. Here are some scenes from the protests: