Angered by the shocking death last month of a black teenager in Florida and upset with the statute that the shooter invoked to avoid prosecution, more than 1,000 people flooded the area around the John A. Wilson Building on Saturday afternoon in a call for justice.

George Zimmerman, the neighborhood watch captain who gunned down 17-year-old Trayvon Martin last month in Sanford, Fla., grew up not too far from D.C. His former neighbors were shocked to hear about what he did.