A clown performs next to photographs placed in the street of people disappeared in Mexico's drug violence as part a protest at Zocalo Square in Mexico City May 30, 2012. Mexico's National Human Rights' Commission estimates at least 5,000 Mexicans have disappeared in the drug war. Pictured in the background is the Metropolitan Cathedral (R). REUTERS/Henry Romero (MEXICO - Tags: POLITICS CIVIL UNREST DRUGS SOCIETY)