A demonstrator holds a placard during a protest on West Florissant Avenue in Ferguson, Missouri on August 18, 2014. Police fired tear gas in another night of unrest in a Missouri town where a white police officer shot and killed an unarmed black teenager, just hours after President Barack Obama called for calm. AFP PHOTO / Michael B. Thomas (Photo credit should read Michael B. Thomas/AFP via Getty Images)
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AFP MICHAEL B. THOMAS