A K-9 dog has discovered six human skulls going through the US mailing system.
The human skulls were shipped from the Netherlands and en route to Iowa before being taken away at O'Hare's International Mail Facility in Chicago.
Three separate packages contained two skulls each, according to .
All of the prohibited items were intended be sent to the same address in Iowa, the outlet reported.
The skulls were passed on to the Centers for Disease Control and Prevention (CDC) for further evaluation.
However, information on the sender and receiver had not been released as of Friday.
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A shipment of live moss bathmats was also discovered by the K-9 named Hitch according to
The shipment from Poland was confiscated because the shipper didn't get the proper permits.
The three bathmats inside were later destroyed.
Custom and Border Patrol (CBP) noted that the bathmats could also contain pests or plant diseases.
Authorities have seized more than 1,600 prohibited items since last October.
CBP said the most confiscated items include sausages, plants and live snails.
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