Box of human heads stolen from truck in Denver: "Pretty shocking"

A box containing human heads was stolen from a parked freight company truck in Denver, officials said Saturday. The box was being transported for medical research purposes and Denver police are investigating the incident.

Someone broke into the truck Thursday morning while it was parked in Denver's Central Park neighborhood on Thursday morning, CBS Denver reported.

The blue-and-white box was marked with a label that said "Exempt Human Specimen," police said. A dolly was also stolen from the truck.