Iranian media has said a US ScanEagle drone was captured "in the last few days" by the naval unit of the Islamic Revolutionary Guards Corps after entering Iranian airspace while gathering information over Gulf waters.
A US Navy spokesman said they were aware of the reports, and were looking into them.
Last month the US said Iranian warplanes shot at an American surveillance drone flying in international airspace. Iran said the aircraft had entered its airspace.
More top news
Two FA Cup final ticket will be blasted into space tomorrow, giving some lucky fans (or passing aliens) the chance to go to Wembley.
Two Danish radio hosts killed a rabbit with a bicycle pump live on air in a bid to highlight the "hypocrisy" of animal welfare campaigners.
The BBC has axed Never Mind the Buzzcocks after more than two decades.