Students clash with police in Santiago, Chile
26 April 2012 Last updated at 01:51 BST
Student protestors have clashed with police in Santiago, Chile.
Demonstrations turned violent as police fired water cannons and tear gas.
Students fired back with rocks and a band of demonstrators apparently separated from the group and set a government security building on fire.
The students want to re-ignite calls for free quality education.
The BBC's Sally Bundock explains