A couple takes cover from a jet of water from a riot police vehicle during a protest marking the 1973 military coup in Santiago September 8, 2013. The 40th anniversary of the coup d'etat that ushered in a 17-year dictatorship under General Augusto Pinochet will be marked on September 11 in Chile. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS CIVIL UNREST ANNIVERSARY)