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The discovery made in Cusco was announced on Friday. The site contained the remains of one child, an adolescent, and two adults.
Archeologists believe the remains found are from the pre-Incan Marcavalle culture, website Presstv.ir reported.
Also found at the site, belonging to around 1,000 B.C., were ancient artifacts, including tools made from obsidian and camelid bones, ceramic fragments bearing artistic motifs known to be associated with the Marcavalle culture, and beaded necklaces.
Archaeologists say what lends significance to the discovery is that no human remains dating back to the Marcavalle culture have ever been found before.
The burial site, which contained two double graves and one single grave, was found on land owned by a Cusco center for juvenile rehabilitation.