(120617) -- LOS CABOS, June 17, 2012 (Xinhua) -- Agents of the Mexican Federal Police take part in a surveillance operation at a check point in Los Cabos, northwest Mexico, on June 17, 2012. The heads of state and government of the 20 most important economies of the world will participate in the 7th G20 Leaders' Summit, that will take place on June 18 and 19 in Los Cabos. (Xinhua/David de la Paz)
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