A package containing a body part was found on train tracks in Manassas Park, officials say.

WASHINGTON – A package containing remains found on train tracks in Manassas Park caused confusion and transportation delays Wednesday night.

Initially, Virginia Railway Express said the remains, which were found in a suspicious package on the tracks in Prince William County, were human.

But WTOP has learned the remains may be that of an animal.

However, John C. Evans, police chief for the City of Manassas Park, said police can’t confirm if the parts were animal or human at this time.

And, while officials wouldn’t confirm what body part was found, VRE officials say it wasn’t a head.

VRE trains on the route stopped while Manassas Park police investigated the scene.

Just before 10:30 p.m. Wednesday night, VRE sent the following tweet:

VRE expects to run a full Manassas service tomorrow. An announcement will be made by 4:30am tomorrow morning if anything changes. — VRE (@VaRailXpress) September 20, 2012

Some passengers reported they’ve received vouchers for future trips.

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(Copyright 2012 by WTOP. All Rights Reserved.)