Iran said on Sunday a "spy drone" had encroached its airspace in May about a month before it downed an American drone as part of a series of escalatory incidents between Tehran and Washington.
Foreign Minister Mohammad Javad Zarif tweeted a map saying the US-made MQ9 Reaper drone — also widely used for carrying out military strikes — had entered his country's airspace on May 26.
Iran shot down a US Global Hawk drone on Thursday, saying it had violated its airspace near the strategic Strait of Hormuz -- a claim the United States denies.
US President Donald Trump called off a planned retaliatory military strike Friday, saying the response would not have been "proportionate", with Tehran warning any attack would see Washington's interests across the Middle East go up in flames.
On Sunday US national security adviser John Bolton cautioned Iran against misinterpreting the last-minute cancellation. "Neither Iran nor any other hostile actor should mistake US prudence and discretion for weakness," Bolton said in Jerusalem.
In Kuwait, the US special representative for Iran, Brian Hook, urged "all nations to use their diplomatic effort to urge Iran to de-escalate and meet diplomacy with diplomacy".
The downing of the US drone came after a series of attacks on tankers in the congested shipping lanes of the Gulf.