Student protesters take cover from a jet of water released form a riot police vehicle during a demonstration against the government demanding changes in the public state education system, in Santiago March 15. Chilean students have been protesting against what they say is profiteering in the state education system.

A Chilean student throws back a tear gas canister at riot police during a protest against the government of President Sebastian Pinera, in Santiago on March 15.

Riot police detain a student during a protest against the government to demand changes in the public state education system in Valparaiso city, about 121 km (75 miles) northwest of Santiago, March 15.