BALTIMORE, MD - APRIL 30: Protesters hold placards as they march to the city hall, which is being protected by soldiers from the US Army National Guard in Baltimore, Maryland on April 30, 2015 during a demonstration over the death of Freddie Gray. Gray, 25, was arrested for possessing a switch blade knife April 12 outside the Gilmor Houses housing project on Baltimore's west side. According to his attorney, Gray died a week later in the hospital from a severe spinal cord injury he received while in police custody. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)
