Demonstrators gesture and chant as they continue to react to the shooting of Michael Brown in Ferguson, Missouri August 17, 2014. U.S. Attorney General Eric Holder ordered a federal autopsy of Brown, a teenager shot dead by a police officer in Ferguson, Missouri, seeking to assure the family and community there will be a thorough investigation into a death that has sparked days of racially charged protests. REUTERS/Lucas Jackson (UNITED STATES - Tags: CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY)