A programming error in "the bug" caused it to spread to computers outside of Natanz.
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However, in June 2013, it was made known (by unspecified legal sources) that he had been placed under a U.S. Justice Department investigation, in its early stages, having to do with an alleged leak of classified information regarding the Stuxnet virus, designed to target and (at least temporarily) disable Iranian nuclear centrifuges, as part of Operation Olympic Games.