More than 200 people have been arrested and dozens injured in Chile after high school students clashed with police during protests over education reforms.
Students have held several protests in recent months
Some 2,000 students marched in the capital Santiago and other parts of the country over the government's perceived lack of progress on the reforms.
Police used tear gas and water cannon, and protesters threw stones at the security forces.
Chile has seen massive student protests in the last few months.
A series of strikes and street rallies involving about 700,000 students were called off in June after the government agreed to a number of their demands.
President Michelle Bachelet ordered the creation of a reform commission and pledged extra funding to repair run-down school facilities and help poorer students.
But some of the students have become frustrated at the pace of progress.
"They are doing some work, but much too slowly, and that's not what they promised," one 15-year-old demonstrator said.
The largely peaceful protest turned violent after small groups of students broke away from the main rally and began throwing stones at the police.
As police attempted to disperse the crowds using tear gas and water cannon, students were seen being arrested and led away to police vans.