"The report examines material provided to the IAEA by U.S. intelligence from a laptop computer that reportedly was smuggled out of Iran. In 2005, U.S. intelligence assessed that information as indicating that Tehran had been working on details of nuclear weapons, including missile trajectories and ideal altitudes for exploding warheads."
Note that nuclear weapons can be used not just for thermonuclear warfare but also to launch an EMP attack, which happens when a nuclear weapon is exploded at an altitude of 30 to 300 miles. This suggests that Iran may be contemplating such an attack.
Are you unfamiliar with what an EMP attack entails? You need to be. Read the sobering details here.