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A demonstrator is detained by plain clothes police officers during clashes following a protest against the visit of Pope Benedict XVI in Madrid Wednesday Aug. 17, 2011. Pope Benedict XVI is due to arrive Thursday for a nearly four-day visit to celebrate World Youth Day, and thousands of protesters railing against his visit marched through central Madrid to the central Sol plaza where they have held months of demonstrations against the government's anti-austerity policies. (AP Photo/Emilio Morenatti)