Chilean police have used water canons and tear gas to break up a demonstration calling for more wide-ranging and free education.
The protests on Tuesday came as President Sebastian Pinera defended his record in a final state of the nation address to Congress.
He recounted his success of creating jobs and announced educational reforms.
Demonstrators included students and members of left-wing movements and unions who are fighting against neo-liberal policies and fight inequality in Chile.
Al Jazeera's Mariana Sanchez reports from Valparaiso.