Residents take part in a rally demanding justice for the killing of black teenager Trayvon Martin in Miami, Florida April 1, 2012. Thousands of protesters gathered in a downtown bayfront park on Sunday demanding the arrest of the neighborhood watch volunteer who shot and killed an unarmed black teenager, Trayvon Martin, in central Florida a month ago. REUTERS/Lucas Jackson (UNITED STATES - Tags: CRIME LAW CIVIL UNREST)