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.
Pakistani authorities stopped an anti-drone protest lead by Imran Khan from entering South Wazirista by placing shipping containers on the highway.
The 15-mile convoy of vehicles were delayed several times during the march and then told that it was unsafe for them to be the on the road after dark.
Despite this the protest was hailed as a "huge success" by the ex-cricketer turned politician. Addressing the crowd he said:
"We want to give a message to America that the more you carry out drone attacks, the more people will hate you"
A 'peace march' led by cricketer-turned-politician Imran Khan against US drone attacks on Saturday has halted in North West Pakistan.
Action by thousands of protesters has reached the city of Dera Ismail Khan, where protesters are at risk of attack by Taliban militants, according to local police.
A delegation of American activists from women's peace group CodePink will take part in a march to Waziristan in the tribal area of Pakistan tomorrow, to protest against the use of unmanned drones in the region. Dianne Budd, a doctor from San Francisco said she was somewhat concerned for her safety:
CodePink co-founder Medea Benjamin said the march was intended to put pressure on the Obama administration to stop the secretive attacks. She said
Imran Khan has started his march from Islamabad to Southern Waziristan, a dangerous tribal area of Pakistan currently the target of CIA drone attacks.
The march has been denounced by various Pakistani Taliban factions, but Khan insisted it would go ahead: