A policeman lies on the ground during a clash with students demonstrating to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Ueslei Marcelino 

A policeman helps an injured collegue during a clash with students demonstrating to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Ueslei Marcelino

A protester is detained by riot policemen during a demonstration to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Carlos Garcia Rawlins TPX IMAGES OF THE DAY

A student sits with his hands up on the street as a police water cannon sprays water during a protest against the government to demand changes in the education system in Valparaiso June 10, 2015. REUTERS/Rodrigo Garrido 

A student plays with a ball on the street in front of riot police during a protest against the government to demand changes in the education system in Valparaiso June 10, 2015. REUTERS/Rodrigo Garrido 

Employees look out the window of a shop during a protest against the government to demand changes in the education system in Valparaiso June 10, 2015. REUTERS/Rodrigo Garrido 

Students drag barricades during a protest against the government to demand changes in the education system in Valparaiso June 10, 2015. REUTERS/Rodrigo Garrido 

A woman looks on during a demonstration to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Ueslei Marcelino 

A demonstrator dressed as a police officer looks on during a demonstration to demand changes in the education system in Santiago, Chile, June 10, 2015. REUTERS/Ueslei Marcelino TPX IMAGES OF THE DAY

A laborer looks out of a building under construction to observe a demonstration to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Ricardo Moraes 

A jet of water hits a street sign carried by a demonstrator as they clash with riot policemen during a demonstration to demand changes in the education system, in Santiago city, June 10, 2015. REUTERS/Ueslei Marcelino 

A student clashes with a police vehicle during a demonstration to demand changes in the education system, in Santiago June 10, 2015. REUTERS/Ueslei Marcelino 

A protester waves a Chilean flag in front of a riot police vehicle as it releases a jet of water during a demonstration to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Carlos Garcia Rawlins 

An injured protester is attended to by friends during a demonstration to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Carlos Garcia Rawlins 

Students run as a riot police vehicle releases a jet of water during a demonstration to demand changes in the education system, in Santiago June 10, 2015. REUTERS/Henry Romero 

Protesters clash with riot police during a demonstration to demand changes in the education system, in Santiago, Chile, June 10, 2015. REUTERS/Ueslei Marcelino TPX IMAGES OF THE DAY

Students take cover as a jet of water is released from a riot police water cannon during a demonstration to demand changes in the education system, in Santiago city, May 28, 2015. REUTERS/Ivan Alvarado TPX IMAGES OF THE DAY

Universidad Catolica de Valparaiso (Valparaiso Catholic University) student Rodrigo Aviles Bravo is pictured, as police fired water cannons to disperse crowds during a rally, as Chile's President Michelle Bachelet delivers a speech inside the National Congress, in Valparaiso May 21, 2015. Aviles suffered a head injury during the demonstration and is in critical condition at a Valparaiso hospital, local media reported. Picture taken May 21, 2015. REUTERS/Ivan Alvarado 

Student protesters gather as a jet of water is released from a riot police vehicle during a demonstration to demand changes in the education system, in Santiago city, May 28, 2015. REUTERS/Ivan Alvarado 

Student protesters kiss during a demonstration to demand changes in the education system, in Santiago city, May 28, 2015. REUTERS/Ivan Alvarado 

Soledad Bravo (3rd L), mother of Rodrigo Aviles, a student injured on May 21 following a protest march, takes part in a rally against police violence in Valparaiso, May 28, 2015. Aviles, who suffered a head injury when the police fired water cannons to disperse crowds during the demonstration on May 21, is in a critical condition at a Valparaiso hospital, local media reported. The placard reads (R): "No more repression". REUTERS/Rodrigo Garrido TPX IMAGES OF THE DAY

A protester kneels eith his skateboard amidst water jets during a demonstration to demand changes in the education system at Santiago, May 14, 2015. REUTERS/Catherine Allen TPX IMAGES OF THE DAY

A demonstrator is detained by riot policemen during a rally, as Chile's President Michelle Bachelet delivers a speech inside the National Congress, in Valparaiso city, May 21, 2015. REUTERS/Carlos Vera TPX IMAGES OF THE DAY

A riot police vehicle catches fire from a Molotov cocktail bomb during a protest at a high school in Santiago September 10, 2014. Chilean students have demanded changes and an end to profiteering in the education system. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS CIVIL UNREST) 

Protesters are hit by a jet of water released from a riot police vehicle during a demonstration against the government to demand changes in the education system at Santiago, April 16, 2015. REUTERS/Ivan Alvarado 

Students cling at a fence while they are detained at the Education Ministry building during its occupation in downtown Santiago, September 12, 2014. Around 15 students occupied the building as part of a protest against a financial crisis in their university. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS CIVIL UNREST EDUCATION SOCIETY TPX IMAGES OF THE DAY) 

Student demonstrators take cover from a jet of water released from a riot police vehicle during a demonstration to demand changes in the Chilean education system, in Santiago May 8, 2014. Thousands of students marched through the Chilean capital on Thursday for the first time since President Michelle Bachelet took power, ratcheting up the pressure on her to fulfill her campaign pledges to overhaul education in the country. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS EDUCATION CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY) 

A riot police removes a flag from a fence at a high school during a protest in Santiago September 10, 2014. Chilean students have demanded changes and an end to profiteering in the education system. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

Protesters are hit by a jet of water released from a riot police vehicle during a protest against the government to demand changes and end to the profiteering in the education system, in Valparaiso, May 14, 2015. REUTERS/Rodrigo Garrido 

A demonstrator is hit by a jet of water from a riot police vehicle during a rally, as Chile's President Michelle Bachelet delivers a speech inside the National Congress, in Valparaiso city, May 21, 2015. REUTERS/Ivan Alvarado 

A student is detained by riot policemen during a protest against a financial crisis in their university in downtown Santiago, October 28, 2014. REUTERS/Ivan Alvarado (CHILE - Tags: POLITICS CIVIL UNREST EDUCATION TPX IMAGES OF THE DAY)