TEHRAN - Iran's supreme court on Monday dismissed an execution sentence passed by a revolutionary court against an Iranian-American national accused of spying for the CIA, the semi-official Fars news agency reported. "The supreme court nullified the execution sentence against Amir Mirza Hekmati and sent it to an affiliate court," said judiciary spokesman Gholamhossein Mohseni-Ejei without giving further details. Hekmati, a 28-year-old of Iranian descent born in the state of Arizona, was arrested in December and Iran's Intelligence Ministry accused him of receiving training at US bases in neighboring Afghanistan and Iraq.