Chilean police employ tear gas, water cannons at student protest interrupted by masked people

Young protesters run away from a water cannon, during a student protest in Santiago, Chile, Thursday, Aug. 21, 2014. Tens of thousands of students protested in the third massive march of the year in Chile. The students are unhappy with the pace of education reform that President Michelle Bachelet has been moving forward. (AP Photo / Luis Hidalgo) (The Associated Press)

A masked protester runs away from a water cannon, during a student protest in Santiago, Chile, Thursday, Aug. 21, 2014. Tens of thousands of students protested in the third massive march of the year in Chile. The students are unhappy with the pace of education reform that President Michelle Bachelet has been moving forward. (AP Photo / Luis Hidalgo) (The Associated Press)

Protester run away from on oncoming tear gas truck, during a student protest march in Santiago, Chile, Thursday, Aug. 21, 2014. Tens of thousands of students protested in the third massive march of the year in Chile. The students are unhappy with the pace of education reform that President Michelle Bachelet has been moving forward. (AP Photo/Luis Hidalgo) (The Associated Press)

Student protesters have fled a tear gas truck and police water cannons during a march through the Chilean capital, but no injuries or arrests have been reported.

Thousands of young people unhappy with the pace of education reform under President Michelle Bachelet participated peacefully in Thursday's march.

But dozens of unidentified people wearing masks interrupted the march, damaging traffic lights and signs, starting fires in trash containers and throwing sticks and stones at police.

Protest organizers say about 80,000 people took part in the march. Interior Undersecretary Mahmud estimates the number of participants at 25,000.

The demonstration created major traffic jams around Santiago's center.

It was the third major march of the year in the South American country.