Officials say more than 500 students have been arrested and 14 wounded during protests for education reform in Chile.
Police on horseback used used water cannons and tear gas to break up the demonstrations in Santiago on Thursday.
Students say the education system in Chile is not funded properly.
The protests intensified after President Sebastian Pinera announced cuts in the education budget earlier this year.
Pinera has called on students to reach negotiated solution with the government based on 21-proposals he presented, but no agreement has been finalized.
Video footage of protests