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© DREAMSTIMEEighteen human heads found at O'Hare Airport on Monday were said to be for medical experiments.
The heads still had the skin on them. Authorities say they believe the heads were medical specimens that became misplaced. Cops don't suspect foul play.

Authorities at Chicago's O'Hare International Airport got a grisly surprise on Monday when they opened a mysterious package and found 18 severed human heads inside.

The heads, which still had the skin on them, appeared to be medical samples from Italy that became misplaced, according to local reports.

Cops don't suspect any foul play.

The heads were taken to the Cook County Medical Examiner's office, authorities said.

U.S. Customs and Border Protection said it has launched an investigation into the incident.