Days after it left Port-of-Spain, Trinidad and Tobago, Russian spy ship, the Viktor Leonov, has been spotted 100 miles south-east of North Carolina in international waters.
US military officials say the ship is now being tracked by the destroyer USS Cole and other naval assets.
The ship is outfitted with a variety of high-tech spy equipment and is designed to intercept communications signals.
After leaving Trinidad and Tobago it was observed close to the Dominican Republic as it made its way north.
It was unclear at the time where the vessel was heading, but the official said the spy ship has typically traveled up the eastern seaboard near Cape Canaveral, King's Bay, Norfolk and New London in the past.
All these locations are home to US naval installations.