A police officer anonymously sued Black Lives Matter and DeRay Mckesson, a prominent activist in the movement, after being injured by a rock thrown during a protest
DeRay Mckesson and four other Black Lives Matter leaders are named as defendants in the suit filed on behalf of one of the officers wounded in the attack
The officer's lawsuit says he was struck in the face by a piece of concrete or a "rock like substance" thrown during a July 9 protest over the death of Alton Sterling