BALTIMORE, MD - APRIL 29:  Students from Baltimore colleges and high schools march in protest chanting 'Justice for Freddie Gray' on their way to City Hall April 29, 2015 in Baltimore, Maryland. Baltimore remains on edge in the wake of the death of Freddie Gray, though the city has been largely peaceful following a day of rioting this past Monday. 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 Win McNamee/Getty Images)