A protester chants during the protest of the police killing of Laquan McDonald in downtown Chicago, Illinois, United States on Nov. 24, 2015. Police released a video on Tuesday showing the shooting of 17-year-old Laquan McDonald, who was killed by Chicago Police officer Jason Van Dyke on Oct. 20, 2014. Jason Van Dyke has been charged with first-degree murder in McDonald's death. (Xinhua/Ting Shen)