10/26/2011 10:21 am ET | Updated Dec 26, 2011

Body Found Atop Semi Trailer On Virginia Interstate

Authorities in Virginia made a bizarre discovery on Tuesday, after a motorist on Interstate 95 spotted a body on top of a tractor-trailer, Virginia State Police said.

The unidentified caller to 911 reported a body on top of the truck while trailing behind it on the Woodrow Wilson Bridge, in Prince George's County, Maryland.

Virginia State Police stopped the semi around 3 p.m., in the southbound lane of the Fairfax County Parkway, in southern Fairfax County. It is unclear whether a driver or passengers were detained when the vehicle was pulled over.

Authorities have launched a death investigation into the discovery. Investigators have yet to identify the person found on the tractor-trailer or to offer an explanation for how they wound up there.

A spokesperson for the Virginia State Police did not immediately return calls seeking an update on the investigation.