Iranian military sources has said,"Our air defence and electronic warfare units managed to identify and shoot down an advanced unmanned spy aircraft - an RQ-170 - after it briefly violated the eastern border territory." The drone "was downed with slight damage. It is now under the control of our forces."
ISAF officials has said "The UAV to which the Iranians are referring may be a US unarmed reconnaissance aircraft that had been flying a mission over western Afghanistan late last week. The operators of the UAV lost control of the aircraft and had been working to determine its status."The RQ-170 Sentinel is a stealthy high altitude and long endurance drone which can fly at an altitude of 50,000ft. The The RQ-170 Sentinel is a tailless flying wing which offers very small Radar cross section (RCS) allowing it to fly near or inside the borders of other countries without being detected.
It was designed to perform intelligence, surveillance, reconnaissance and target acquisition (ISTAR) missions and provide real time information including imagery or videos to the ground stations.