Chile's capital, Santiago, was gripped by riots as protesters marked the Day of the Young Combatant.
The day - which commemorates the killing of two students during military rule - is often marred by violence.
The clashes between police and protesters began on Thursday and lasted into the early hours of Friday.
Police detained more than 800 protesters - many of them of school age. Dozens of police officers were reported to have been injured in the clashes.
Water cannons and tear gas were used by riot police trying to quell the demonstrations.
This year's demonstration coincided with protests about the quality of a new public transport system and the speed of educational reforms.
The protests started near the presidential palace, in the centre of Santiago, and spread to other areas of the city.
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