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Iran also believes that the United States and Israel were behind the Stuxnet cyberattack that forced the temporary shutdown of thousands of centrifuges at a nuclear facility there in 2010.

Frank Cilluffo, , a former special assistant for homeland security to President George W. Bush, said U.S. authorities have suspected Iran of trying to plot cyberattacks against American targets, including nuclear plants. He said that Iran’s Revolutionary Guard Corps appears to now be trying to bring some hacker groups under its control.

Iran has been doing a lot of cyber-saber-rattling,” said Mr. Cilluffo, now director of George Washington University’s Homeland Security Policy Institute. “What they lack in capabilities, they more than make up for in intent.”