U.S. reacts to Zimmerman verdict
Protests, marches and vigils have been held since Saturday, when George Zimmerman, who shot Martin, was acquited of all charges brought against him.
The crowd marched along downtown streets singing civil rights hymns and chanting "No justice, no peace," as police looked on.
Thousands of demonstrators from across the country protested a jury's decision to clear neighborhood watch volunteer George Zimmerman in the shooting death of 17-year-old Trayvon Martin.
Read more: Rallies against Zimmerman acquittal held across U.S.