(NBC News) Authorities at Chicago’s O’Hare International Airport are holding up a shipment of 18 human heads meant to be used in anatomical research at a facility in the Chicago suburbs, local media reported.

The heads arrived from Rome just before Christmas, and officials initially said an issue with paperwork caused the hold-up, according to the Chicago Sun-Times. But the newspaper reported Tuesday that authorities stopped the shipment from going through because it was headed to a facility that is under investigation.

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