Demonstrators roll tires to build a barricade and block a bridge during protests against Nicolas Maduro's government in San Cristobal, about 410 miles (660 km) southwest of Caracas, February 26, 2014. Pope Francis called on Wednesday for an end to violence in Venezuela that has killed at least 13 people and urged politicians to take the lead in calming the nation's worst unrest for a decade. The banner reads, “Resistance”. (Photo by Carlos Garcia Rawlins/Reuters)
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