Iran claims seizure of U.S. drone over Persian Gulf December 4, 2012 -- Updated 1038 GMT (1838 HKT) (File photo) The drone was seized as it flew over the Persian Gulf, Iranian state media says. NEW: The U.S. Navy has accounted for all its drones, a U.S. defense official says NEW: United States operates only in internationally recognized air space in the Gulf, says source The drone was seized as it flew over the Persian Gulf, Iranian state media says Iran's Revolutionary Guard says the drone was collecting data Tehran, Iran (CNN) -- A unit from Iran's navy has captured a U.S. drone flying over the Persian Gulf, according to Iranian state media reports Tuesday. The drone, which was collecting data, was captured immediately after entering Iranian airspace, Iran's Revolutionary Guard Corps is cited as saying by the state-run news agency IRNA. Read more: A dangerous new world of drones However, a U.S. defense official, who could not be named because they were not authorized to speak to the media, told CNN that whatever the Iranians claim to have, it is not an actively operating U.S. Navy drone. The U.S. Navy has fully accounted for all unmanned air vehicles (UAV) operating in the Middle East region. Our operations in the Gulf are confined to internationally recognized water and air space," the source said. Read more: Key U.S. official defends use of drones The internationally recognized territorial limit is 12 nautical miles off the coast. Iranian state media quoted Adm. Ali Fadavi, of the Revolutionary Guards, as saying the unmanned aerial device was a ScanEagle. The ScanEagle, with a wingspan of just over 10 feet, is designed to fly for 24 hours or more without refueling and can support extreme temperatures and high winds, according to its manufacturer. It can be launched from the ground or from a warship. Iran's Press TV showed footage of what purported to be a drone. Last month, the Pentagon said Iranian jets had fired on a U.S. drone as it flew off the Iranian coastline in the northern Persian Gulf. The armed MQ-1 Predator was on a routine surveillance mission above international waters, 16 miles off the coast, the Defense Department said. A year ago, a high-altitude RQ-170 Sentinel crashed in the Iranian desert after leaving an airbase in Afghanistan, U.S. officials said. Iranians claimed to have shot it down, and created a toy model of the drone to celebrate its capture. CNN's Barbara Starr and Stefan Simons contributed to this report. Children swarm local volunteers as they literally scrape the bottom of pots for food. CNN's Arwa Damon reports. China is looking to lead tech development in the "Internet of Things" industry. December 4, 2012 -- Updated 0335 GMT (1135 HKT) Britain's Prince William and Catherine, Duchess of Cambridge, are expecting their first child after 19 months of marriage, the palace announced.