The contaminant has been linked to the deaths of more than 300 children in Africa and Asia
"Iran's army air defense detected and warned an American drone in the eastern airspace of the country. It was coming from Afghanistan. The drone left the area," Tasnim quoted the Iranian military as saying.
Tasnim gave no details on how the Iranian authorities had warned the unmanned drone to leave its airspace.
A US defense official said last week that four of Iran's Islamic Revolutionary Guard Corps (IRGC) vessels 'harassed' a US warship on Tuesday near the Strait of Hormuz.
Tehran said the ships had only been carrying out their regular duties monitoring foreign ships near Iranian waters.