Youths walk past a mural calling for peace in Ferguson, Mo., on a building up the street from the city's police department a day before the grand jury decision was announced. David Goldman/AP hide caption

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Members of the National Guard detain a protester in Ferguson, Mo., on Wednesday. More than 2,000 National Guard troops spread out across the St. Louis area to prevent another night of rioting and looting after a grand jury declined to indict officer Darren Wilson in the fatal shooting of 18-year-old Michael Brown. Adrees Latif/Reuters /Landov hide caption

itoggle caption Adrees Latif/Reuters /Landov

This undated photo released by the St. Louis County Prosecuting Attorney's office on Monday shows Ferguson police Officer Darren Wilson during his medical examination after he fatally shot Michael Brown. AP hide caption

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This photo, provided by the St. Louis County Prosecutor's Office, shows Ferguson, Mo., police Officer Darren Wilson shortly after his encounter with Michael Brown. A grand jury declined Monday to charge Wilson with killing 18-year-old Brown. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Police guard the Ferguson police department as rioting erupts following the grand jury announcement in the Michael Brown case on Monday in Ferguson, Mo. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images

A storage facility in Ferguson, Mo., is on fire following the decision Monday by a grand jury not to charge police officer Darren Wilson in the shooting death of 18-year-old Michael Brown. Demonstrators clashed with police and set buildings on fire. St. Louis County Police Chief John Belmar said the unrest was worse than that which erupted after Brown was killed in August. Jeff Roberson/AP hide caption

itoggle caption Jeff Roberson/AP