Iran says is building copy of captured US drone FILE - This file photo released on Thursday, Dec. 8, 2011, by the Iranian Revolutionary Gu...

Iran says is building copy of captured US drone

FILE - This file photo released on Thursday, Dec. 8, 2011, by the Iranian Revolutionary Guards, claims to show the chief of the aerospace division of Iran's Revolutionary Guards, Gen. Amir Ali Hajizadeh, left, listening to an unidentified colonel as he points to US RQ-170 Sentinel drone which Tehran says its forces downed earlier this week. (AP Photo/Sepahnews, File)

Iran claimed Sunday that it had recovered data from an American spy drone that went down in Iran last year including that it was used to spy on Osama bin Laden's house weeks before he was killed by U.S. forces. Iran also said it was building a copy of the surveillance aircraft.

This type of drone has been used in Afghanistan for years and was used to keep watch on bin Laden's compound in Pakistan but U.S. officials have said little about the history of the particular drone now in Iran's possession. Iran has also been known to exaggerate its military or technological prowess.

Tehran says it brought down the RQ-170 Sentinel, a top-secret surveillance drone with stealth technology, and has flaunted the capture as a victory for Iran and a defeat for the United States. The U.S. says the drone malfunctioned and downplayed any suggestion that Iran could mine the aircraft for sensitive information because of measures taken to limit the intelligence value of drones operating over hostile territory.

The drone went down last December in eastern Iran and was recovered by Iran almost completely intact. After initially saying only that it had lost a drone operating near the Afghan-Iran border, U.S. officials eventually confirmed the drone was monitoring Iran's military and nuclear facilities.

Washington has asked for it back, a request Iran rejected.

The chief of the aerospace division of the powerful Revolutionary Guards, Gen. Amir Ali Hajizadeh, told state television that the captured surveillance drone is a "national asset" for Iran and that he could not reveal full technical details.

But he did provide some samples of the data that he claimed Iranian experts had recovered from the aircraft, state television reported.

"There is almost no part hidden to us in this aircraft. We recovered part of the data that had been erased. There were many codes and characters. But we deciphered them by the grace of God," Hajizadeh said.

Among the drone's past missions, he said, was surveillance of the compound in northwest Pakistan in which bin Laden lived and was killed. Hajizadeh claimed the drone flew over bin Laden's compound two weeks before the al-Qaida leader was killed there in May 2011 by U.S. Navy SEALs.

He also listed a litany of tests and maintenance that the drone had undergone, all of which he said had been recorded in the aircraft's memory. According to Hajizadeh, the drone was taken to California on Oct. 16, 2010 for "technical work" and then to Kandahar, Afghanistan on Nov. 18, 2010. He said it carried out flights from Afghanistan but ran into some problems that U.S. experts were unable to fix. Then the drone was taken to Los Angeles in December 2010 where the aircraft's sensors underwent testing, Hajizadeh said.

"If we had not achieved access to software and hardware of this aircraft, we would be unable to get these details. Our experts are fully dominant over sections and programs of this plane," he said.

Hajizadeh said he provided the details to prove to the Americans "how far we've penetrated into this aircraft."

The U.S. Defense Department said it does not discuss intelligence matters and would not comment on the Iranian claims.

The semi-official Mehr news agency said Iran had reverse-engineered the aircraft and has begun using that knowledge to build a copy of the drone.

Sen. Joe Lieberman, an independent from Connecticut who chairs the Senate Homeland Security and Governmental Affairs Committee said on "Fox News Sunday" that he views the reports with skepticism.

"There is a history here of Iranian bluster, particularly, now when they are on the defensive because of the economic sanctions against them. Look, it was not good for the U.S. when the drone went down in Iran and not good when the Iranians grabbed it. I don't have confidence at this point that they are really able to make a copy of it," Lieberman said.

Iran has gone a long way in reverse-engineering some key technologies in the past three decades, particularly in the areas of nuclear and missile technology.

Iran's famous Shahab-3 missile, first displayed in 1998, is believed to be based on North Korea's Nodong-1 design. Iran obtained its first centrifuge from Pakistan in 1986 and later reverse engineered it to develop its now advanced uranium enrichment program.

Centrifuges, which purify uranium gas, are the central component of a process that can make fuel for power plants or — at higher levels of processing — weapons.

However, unlike the situation with the drone, the Iranian government usually touts these achievements as the result of an indigenous, home-grown research.

One area where there is concern is whether Iran or other states could reverse-engineer the chemical composition of the drone's radar-deflecting paint or the aircraft's sophisticated optics technology that allows operators to positively identify terror suspects from tens of thousands of feet in the air.

How much data there is on the drone is another question. Some surveillance technologies allow video to stream through to operators on the ground but do not store much collected data. If they do, it is encrypted.

Media reports claimed this week that Russia and China have asked Tehran to provide them with information on the drone but Iran's Defense Ministry denied this.

(Agencies)