Students clashed with riot police in Chile's capital Santiago during protests that marked the second anniversary of conservative President Sebastian Pinera taking office on Wednesday.
The protests coincided with the 30th anniversary of Chile's return to democracy after Augusto Pinochet's 1973-1990 dictatorship.
During a ceremony in Santiago, Pinera said that 30 years of democratic rule in Chile had been a "fertile" period that dragged eight million Chileans out of poverty.
But he also recognized shortcomings and inequalities that hurt "the soul of our nation."