Demonstrators with masked faces take part in a protest to commemorate the 1973 military coup, in Valparaiso city, northwest of Santiago, September 11, 2014. Thursday marks the 41st anniversary of the coup d'etat in Chile that ushered in a 17-year dictatorship under former General Augusto Pinochet. REUTERS/Eliseo Fernandez (CHILE - Tags: POLITICS CIVIL UNREST ANNIVERSARY)