Anti-government demonstrators wearing masks, throw back tear gas canisters fired by Bolivarian National Police during clashes at the Central University of Venezuela, UCV, in Caracas, Venezuela, Thursday, March 20, 2014. Thursday dawned with two more opposition politicians, San Cristobal Mayor Daniel Ceballos and San Diego Mayor Enzo Scarano, behind bars. Police used tear gas and water cannons to disperse a student-called protest of several thousand people in Caracas, some of those demonstrating against the arrests of the mayors. (AP Photo/Esteban Felix)

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