(ANSA) - BELGRADE, SEP 18 - The carcass of a drone was discovered on the rocks of the beach in the Tiulenovo area, on the northern Bulgarian coast of the Black Sea, most likely dragged by the flow of the waves. According to preliminary investigations this morning, the aircraft has a wingspan of about three metres. An 82 caliber artillery mortar shell can be seen attached to the drone with adhesive tape. (ANSA).