An anti-government demonstrator wearing a mask, throws a tear gas canister fired by Bolivarian National Police towards a water cannon vehicle, during clashes in a protest 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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