An employee at Southwest Airlines pulled a package from its shipping list because it hadn’t been labeled properly. But wait, it gets better. Inside the package was a few dozen human heads and parts of human heads.

The shipment had been en route to a medical research company in Fort Worth, Texas, but they are currently being held in Little Rock, where authorities are making sure the craniums were obtained legally.

Says the local coroner:

We’ve come to the conclusion that there is a black market out there for human body parts for research or for whatever reason… We just want to make sure these specimens here aren’t a part of that black market and underground trade.

While the Arkansas-based company that attempted to ship the heads claims they did nothing wrong and filled out all the correct paperwork, NBC in Dallas reports that the company recently had its business license revoked.

Southwest seizes dozens of human heads [MSNBC]

Southwest Finds Shipment of Heads on a Plane [NBCDFW]

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