Riot police officers detain activists from the Mapuche Indian movement during a rally in Santiago January 23, 2008. The rally was held in support of Patricia Troncoso, a pro-Mapuche activist held in prison who is on a hunger strike, and in memorial of Matias Catrileo Quezada, a young Mapuche man who died after being shot during clashes with the police in a land dispute in southern Chile. REUTERS/Victor Ruiz Caballero (CHILE)