When Mexican cops stumbled upon a pile of about 150 skulls in a cave near the Guatemalan border a decade ago, they thought they were looking at a crime scene. In a way, they were correct, but it has turned out to be a very cold case dating back a millennium.It took 10 years of tests and analysis to determine the toothless craniums of men and women were from sacrificial victims killed between AD 900 and 1200, the National Institute of Anthropology and History said Wednesday.
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