The UN has accused the Chilean police and armed forces of committing serious human rights violations in their response to recent mass demonstrations.
UN investigators say they have verified four cases of unlawful deaths involving state agents.
It notes 345 people have suffered eye trauma from pellets, with torture and sexual violence also highlighted.
Some 1,600 people remain in pre-trial detention out of 28,000 detained since mid-October.
Protesters are demanding social reforms and changes to a constitution that dates back to the pre-democracy era of the late military leader, Augusto Pinochet.
At least 26 people have been killed and hundreds injured in the unrest.