Protesters took to the streets of Santiago and other cities across Chile early Sunday, erecting barricades, firing shots and clashing with police out to stop Young Combatants Day demonstrations.
One police officer was wounded by gunfire in the clashes, police spokesmen said.
Demonstrators engaged in acts of vandalism for a second straight night, with larger numbers of protesters in the streets of poor neighborhoods around the capital, police said.
Protesters sabotaged power lines, leaving several thousand people without electricity.
Day of the Young Combatant marks the deaths of brothers Rafael and Eduardo Vergara Toledo, Revolutionary Left Movement, or MIR, members killed by the security forces on March 29, 1985, in Villa Francia, located in the Santiago metro area, during a protest against Gen. Augusto Pinochet's 1973-1990 military dictatorship.
Groups of anarchists and other protesters have marked Day of the Young Combatant with acts of violence and vandalism in recent years.
Some of the worst violence was reported in Villa Francia, where groups of young masked men put up barricades, fired shots and fought with police.
A corporal with the Carabineros militarized police force was shot in the arm in San Bernardo, a neighborhood in the southern part of Santiago.
The officer was taken to the police force's hospital, where he is listed in stable condition.
Some reporters covering the protests were wounded by pellets fired at them in Villa Francia, media reports said.
Six people were arrested early Sunday, the Carabineros said, adding that 31 others were detained the previous evening.
Other incidents were reported in the La Granja neighborhood, where protesters burned a bus, as well as in the Quilicura, La Pintana, Cerro Navia, San Bernardo and Huechuraba districts.
Clashes between police and demonstrators also occurred in the cities of Valparaiso and La Serena. EFE