Amir Mirzai Hekmati, a 28-year-old former Marine born in the United States to an Iranian family, was "sentenced to death for cooperating with a hostile nation, membership of the CIA and trying to implicate Iran in terrorism," the judge in Tehran ruled, the Fars and ISNA news agencies reported. The United States condemned the reported death sentence and said allegations that Hekmati worked for the CIA were "false." Hekmati has 20 days to appeal, ISNA quoted chief prosecutor Gholam Hossein Mohseni Ejei as saying, without specifying when the sentence was handed down. The accused was shown on state television in mid-December saying in fluent Farsi and English that he was a Central Intelligence Agency operative sent to infiltrate Iran's intelligence ministry. He had been arrested months earlier. Iranian officials said his cover was blown by agents for Iran who spotted him at the US-run Bagram military air base in neighbouring Afghanistan.