Jaden Jackson, 9, of Miami, Florida, holds up a sign during an NAACP march and rally in front of the Sanford Police Department for Trayvon Martin in Sanford, Florida, March 31, 2012. George Zimmerman, a neighborhood watch captain, told police he fatally shot Martin after the teenager punched him, knocked him down and slammed his head into the ground, the Orlando Sentinel reported on Monday. The February 26 killing of the black teenager as he walked through a gated community by Zimmerman, a white Hispanic, has triggered protests around the country and calls for Zimmerman’s arrest. REUTERS/David Manning (UNITED STATES – Tags: CRIME LAW CIVIL UNREST)