Back in the United States, Black Lives Matter activists have repeatedly disrupted the U.S. Conference of Mayors meeting in Washington, D.C., to protest police killings of unarmed African Americans across the country. Protesters held signs reading “16 Shots is a cover up. #LaquanMcDonald #ResignRahm”—a reference to Chicago Mayor Rahm Emanuel. He’s facing increasing protests over a possible cover-up of the police killing of unarmed African-American teenager Laquan McDonald, who was shot 16 times by white police officer Jason Van Dyke more than one year ago. Activists also disrupted the speech of Baltimore Mayor Stephanie Rawlings-Blake by shouting, “You failed us!” This comes as the trial of three Baltimore police officers charged in the death of unarmed African American Freddie Gray is slated to resume Friday, after a judge denied a motion that would have compelled a fellow officer to testify in their cases, threatening to postpone the trials indefinitely.