Protester throws stones at police during a protest against the government of Colombian President Santos in Medellin

A protester throws stones at police during a protest against the government of Colombian President Juan Manuel Santos in Medellin August 29, 2013. Santos, who has been unable to end the so-called national strike that has united potato growers, milk producers, teachers and health workers, acknowledged agriculture is in crisis, but called for peaceful dissent while talks about possible solutions are going on. REUTERS/Albeiro Lopera (COLOMBIA – Tags: POLITICS CIVIL UNREST)