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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