A protester hurls a rock at the police during a protest to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Marcos Brindicci/Reuters)

Riot police run to control a students' demonstration for education reform, in Temuco June 25, 2015. (Photo by Mariana Bazo/Reuters)

Students run away from a jet of water from a riot police water cannon during a demonstration for education reform, in Temucho June 25, 2015. (Photo by Andres Stapff/Reuters)

A demonstrator, next to dogs, is hit by a jet of water from a police water cannon, during a protest to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Marcos Brindicci/Reuters)

Students run away from a jet of water from a riot police water cannon during a demonstration for education reform, in Temuco, June 25, 2015. (Photo by Andres Stapff/Reuters)

Protesters push police barriers during a protest to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Marcos Brindicci/Reuters)

Protesters clash with riot policemen during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ricardo Moraes/Reuters)

A police vehicle aims a jet of water to disperse students demonstrating to demand changes in the education system, in Santiago, Chile June 25, 2015. (Photo by Henry Romero/Reuters)

Protesters use slingshots against police during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ueslei Marcelino/Reuters)

A protester reacts as police use water cannon during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ueslei Marcelino/Reuters)

A protester hurls a stone at police during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ueslei Marcelino/Reuters)

A protester hurls a stone at police during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ueslei Marcelino/Reuters)

A student is detained by riot police during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ueslei Marcelino/Reuters)

A protester, with a bottle, runs towards police during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ueslei Marcelino/Reuters)

A man takes a break as riot policemen stand guard during a protest to demand changes in the Chilean education system in Valparaiso city, Chile June 25, 2015. (Photo by Lucas Alvarado/Reuters)

Students perform next to riot policemen during a demonstration to demand changes in the Chilean education system in Santiago, Chile June 25, 2015. (Photo by Ricardo Moraes/Reuters)