Youths in the Chilean capital, Santiago, protest against the authorities as they demand changes to the education law.
The protests turned violent on Tuesday, with riot police making hundreds of arrests.
A protester aims a catapult at police. The government has said it has already addressed some of the protesters' demands.
Tuesday's strike was the second one called within a week in protest at the education system. The protesters want more concessions for poorer students.
Shopkeepers in Santiago watch from shuttered premises. Many businesses were looted.
Riot police used water cannons to disperse the protesters and quell looting.
Demonstrations were not confined to the capital, Santiago. Thousands also marched in cities such as Valparaiso.