Separate outbursts of violence occurred around the city during the night and in the early hours of the morning, the media said.
The police said that Sargent Dagoberto Santana Pardo sustained wounds to his nose and jaw from a stone thrown at his face while deployed in San Bernardo, a southern district of Santiago.
Another officer, Second Sargent Álex Zepeda Santos, sustained wounds caused by 16 pellets, said the police, while on patrol in Quilicura, a north-western district of Santiago.
And the guard of a car dealer shop was shot in one of his hands, news shows reported.
TV and newspapers stories said that barricades were set on fire in 6 districts of Santiago, and that in one of them, the district of La Granja, at least two cars were set ablaze.
In the district of Estación Central, a gas station was looted and clashes between police officers and demonstrators were reported in the media.
From the perspective of the Chilean audience, all of this is expected on the Day of the Fighting Young Man. For Chileans, it's not a matter of if, but of how much, how many, where...
In fact, people tune in to TV news and read the papers to know how much damage was caused to private or public property, how many were injured or arrested, where the worst violence occur, or if someone was killed, because unrest is always expected on March 29, with many companies and government agencies closing at 4 p.m. so that workers can leave at 5 p.m.
The Day of the Fighting Young Man commemorates the murder, 32 years ago, of two young brothers, aged 18 and 19, at the hands of agents of the dictatorship led by the late General Augusto Pinochet, which then ruled the country.
But the day is synonym of unrest and demonstrations, which leads workers to leave their jobs early to seek shelter at home.