Thousands of students have marched through the Chilean port of Valparaiso to demand more money for public education and to show support for student leaders who met with lawmakers.
While most of the demonstrators were peaceful, some hurled rocks and other objects at police, who responded with water cannon and tear gas. Three police officers were hurt, and about 20 protesters were detained.
Protest organisers estimated the crowd at about 15,000, while police said about 5,000 marchers took part.
It was the first time leaders of the protest movement have formally met with leaders in Congress since the demonstrations started in early May.
Protesters have demanded more funding and other changes to the public education system. The annual budget is due to be approved by November 30.
After meeting with lawmakers, university student Giorgio Jackson said: "We should at least obtain a small victory."
AP