Crowds are gathering in Baltimore's Sandtown neighborhood, where 25-year-old Freddie Gray was fatally injured while in the custody of Baltimore police.
March organizer Malik Shabazz used a bullhorn to urge a crowd near the Western District police station house to join the march.
A much larger crowd is expected to gather at City Hall at 3 p.m.
Demonstrators have flooded the streets of Baltimore almost every day since Gray's death. They are demanding answers from the city and the police department about what happened to Gray, and what went wrong.
Gray was arrested on April 12, and died one week later.