What can Iran do with America's spy drone?
Seeing as they won't give it back, the BBC investigates what Iran can actually do with America's spy drone:
'So how easy is it to extract information from a drone?It all depends what state the aircraft was in when they recovered it, says Nick Brown, editor-in-chief of Jane's International Defence Review.
"It could have crashed and come apart. The version seen on the video clips could be a reconstruction. But if the aircraft is relatively intact, you could take a fair bit from it."
One thing the Iranians might be doing is testing it with radar in an anechoic chamber, he says, to find its "radar cross-section", which is a measure of how detectable it is. They could also learn from some of the more exotic radar-defeating shaping and materials.
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Even if the Iranians aren't up to the challenge of reverse-engineering the drone, the BBC notes that there are reports of Russian and Chinese scientists in Iran interested in taking a peak.