There had been speculation that the United States had a role in developing Flame, but the collaboration on the virus between Washington and Israel has not been previously confirmed. Commercial security researchers last week reported that Flame contained some of the same code as Stuxnet. Experts described the overlap as DNA-like evidence that the two sets of malware were parallel projects run by the same entity.
Spokespersons for the CIA, the NSA and the Office of the Director of National Intelligence, as well as the Israeli Embassy in Washington, declined to comment.
