A masked demonstrator readies to throw a petrol bomb towards the police during a protest at the University of Santiago, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

A protester holds up his skateboard in front of a riot police vehicle as they clash during a demonstration to demand changes in the education system at Santiago, May 14, 2015. (Photo by Ivan Alvarado/Reuters)

Protesters hit a drugstore during a demonstration to demand changes in the education system at Santiago, May 14, 2015. (Photo by Ivan Alvarado/Reuters)

A masked demonstrator readies to throw a petrol bomb towards the police during a protest at the University of Santiago, in Santiago, Chile, Thursday, May 14, 2015. In the capital and other cities across the country, high school and university students marched, for the second time this year, to demand education reform. (Photo by Luis Hidalgo/AP Photo)

Protesters hit a drugstore during a demonstration to demand changes in the education system at Santiago, May 14, 2015. (Photo by Ivan Alvarado/Reuters)

A protester throws a bottle at a riot police vehicle as they clash during a demonstration to demand changes in the education system at Santiago, May 14, 2015. (Photo by Ivan Alvarado/Reuters)

A masked demonstrator readies to throw a petrol bomb towards the police during a protest at the University of Santiago, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

A student is detained by riot police during a protest against the government to demand changes and end to the profiteering in the education system, in Valparaiso, May 14, 2015. (Photo by Rodrigo Garrido/Reuters)

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. (Photo by Rodrigo Garrido/Reuters)

A demonstrator marches with a cardboard box on her head during a march for free education, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

Protesters clash with riot police during a demonstration to demand changes in the education system at Santiago, May 14, 2015. (Photo by Ivan Alvarado/Reuters)

A protester kneels eith his skateboard amidst water jets during a demonstration to demand changes in the education system at Santiago, May 14, 2015. (Photo by Catherine Allen/Reuters)

Teachers take part in a protest against the government to demand changes and end to the profiteering in the education system, in Valparaiso, May 14, 2015. The placard reads (L), “Modification of the basic salary”. (Photo by Rodrigo Garrido/Reuters)

A student is detained by riot police during a protest against the government to demand changes and end to the profiteering in the education system, in Valparaiso, May 14, 2015. (Photo by Rodrigo Garrido/Reuters)

A masked demonstrator throws a petrol bomb towards the police during a protest at the University of Santiago, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

A protester confronts a jet of water shot from a police operated water cannon, during a student protest, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

A protester is detained by the police during clashes during a student demonstration in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

A masked demonstrator readies to throw a petrol bomb towards the police during a protest at the University of Santiago, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

Protesters recover after being hit by a jet of water from a police operated water cannon at the University of Santiago, during clashes between students and police, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)

A protester runs from a jet of water shot from a police water cannon in the courtyard of the University of Santiago, during clashes between students and police, in Santiago, Chile, Thursday, May 14, 2015. (Photo by Luis Hidalgo/AP Photo)