A riot policeman shoots rubber bullets during a protest marking the 1973 military coup in Santiago
A riot policeman shoots rubber bullets during a protest marking the 1973 military coup in Santiago, September 7, 2014. The 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)
Demonstrators hit a man, who they say is a plainclothes policeman, during a protest marking the 1973 military coup in Santiago
Demonstrators hit a man, who they say is a plainclothes policeman, during a protest marking the 1973 military coup in Santiago September 7, 2014. The 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)
A demonstrator is detained by riot policemen during a protest marking the 1973 military coup in Santiago
A demonstrator is detained by riot policemen during a protest marking the 1973 military coup in Santiago, September 7, 2014. The 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)
A demonstrator is detained by riot policemen during a protest marking the 1973 military coup in Santiago
A demonstrator is detained by riot policemen during a protest marking the 1973 military coup in Santiago, September 7, 2014. The 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)
A demonstrator uses a slingshot during a protest marking the 1973 military coup in Santiago
A demonstrator uses a slingshot during a protest marking the 1973 military coup in Santiago, September 7, 2014. The 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 ANNIVERSARY CIVIL UNREST)
A demonstrator throws a molotov cocktail at riot policemen during a protest marking the 1973 military coup in Santiago
A demonstrator throws a molotov cocktail at riot policemen during a protest marking the 1973 military coup in Santiago September 7, 2014. The 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 ANNIVERSARY CIVIL UNREST TPX IMAGES OF THE DAY)
A medic attends to a follower of the Shi'ite Houthi, who had inhaled tear gas, during clashes with riot police on the airport road in Sanaa
A medic attends to a follower of the Shi'ite Houthi, who had inhaled tear gas, during clashes with riot police on the airport road in Sanaa September 7, 2014. Yemeni riot police used tear gas and water cannon to disperse Shi'ite Muslim Houthi protesters blocking the road between the capital and Yemen's main airport on Sunday, in an escalation of weeks of protests. Warplanes also bombed armed Houthi rebels in al-Jawf province, killing 13 of them, according to government sources. Tens of thousands of Houthis have spent weeks camping around Sanaa in protest at the government against which they have fought, on and off, for a decade in northwest Yemen. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST)
Demonstrators try to open a door of a supermarket during a protest marking the 1973 military coup in Santiago
Demonstrators try to open a door of a supermarket during a protest marking the 1973 military coup in Santiago September 7, 2014. The 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)
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Demonstrators hit a security camera during a protest marking the 1973 military coup in Santiago
Demonstrators hit a security camera during a protest marking the 1973 military coup in Santiago September 7, 2014. The 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)