Police found the skulls in a cave near the Guatemalan border, most of which were females. Experts say they were decapitated and put on a trophy rack.
When Mexican police found a pile of about 150 skulls in a cave near the Guatemalan border, they thought they were looking at a crime scene, and took the bones to the state capital.
It turns out it was a very cold case.
It took a decade of tests and analysis to determine the skulls were from sacrificial victims killed between A.D. 900 and 1200, the National Institute of Anthropology and History said Wednesday.
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