Iran says it has brought down a mock spy drone LONDON (Reuters) - Iran's Revolutionary Guards said they had conducted tests aimed at bringing down a "hypothetical" foreign surveillance drone during a military exercise, the official Fars news agency said on Saturday. The Islamic Republic News Agency, another official news agency, also reported the exercise, but omitted the word hypothetical giving the impression that a real drone had been downed. Other official Iranian media outlets later referred to the downing of a "hypothetical" aircraft. This story is corrected to make clear that real drone was not downed