Demonstrators clash with riot police during a protest against the government to demand changes in the public state education system in Valparaiso city, about 121 km (75 miles) northwest of Santiago, September 29, 2011. The students are demanding for free and better state education, as well as for an end to profit-making in the public education system. REUTERS/Eliseo Fernandez (CHILE - Tags: POLITICS EDUCATION CIVIL UNREST)
A riot police officer hits a student during a protest against the government to demand changes in the public state education system in Valparaiso city, about 121 km (75 miles) northwest of Santiago, September 29, 2011. The students are demanding for free and better state education, as well as for an end to profit-making in the public education system. REUTERS/Eliseo Fernandez (CHILE - Tags: POLITICS EDUCATION CIVIL UNREST)