Riot policemen guard the entrance to the city of Puno, Peru, ahead of a possible anti-mining protest Monday, May 30, 2011. A blockade that has paralyzed commerce and triggered violence in Desaguadero,... more 
Riot policemen guard the entrance to the city of Puno, Peru, ahead of a possible anti-mining protest Monday, May 30, 2011. A blockade that has paralyzed commerce and triggered violence in Desaguadero, a nearby border crossing with Bolivia, is being held since May 9, when residents began demanding Peru's government to revoke the license for the Canadian-owned Santa Ana silver mine. less 
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Associated Press | Photo By Juan Karita
Mon, May 30, 2011 8:05 PM EDT