Doesn''t a threat like this indicate a clear inability to actually do it?
Iran's intelligence chief on Wednesday accused the United States of flying spy drones over its nuclear sites and threatened to shoot down the unmanned surveillance crafts.
Intelligence Minister Ali Yunesi comments backed a report in The Washington Post on Sunday that quoted unidentified U.S. officials as saying the drones have been flying over Iran for nearly a year to seek evidence of nuclear weapons programs.
Of course, it's tough to get anything over on Iran's Intelligence Minister, although his copy of the Washington Post must have taken two days to arrive.