By Iranian military forces were conducting a search to find the crew of the aircraft that was hit over southwestern Iran, the Fars news agency said on Friday.
The downing is the first such report since the US-Israeli war with Iran began on February 28.
State media outlets in Iran showed photos of the wreckage of the jet and what appears to be an ejection seat with an attached parachute.
The Reuters news agency cited two US officials saying that a fighter jet was shot down over Iran and that a search and rescue operation was under way for survivors. The Associated Press has reported one person was recovered.
After the jet was downed, Iranian Parliament Speaker Mohammad-Bagher Ghalibaf mocked US President Donald Trump’s repeated claims of victory in the war.
“After defeating Iran 37 times in a row, this brilliant no-strategy war they started has now been downgraded from ‘regime change’ to ‘Hey! Can anyone find our pilots? Please?’” Ghalibaf wrote in a social media post.
According to Iranian reports, the aircraft was an F-15 jet and likely manned by two pilots.
Later on Friday, a spokesperson for the Iranian military’s Khatam al-Anbiya Central Headquarters said air defences completely destroyed the jet, adding that search operations are still ongoing.
There was no immediate comment on the incident from the Pentagon and US Central Command (CENTCOM).
In past Iranian claims of downing US jets, CENTCOM has been quick to deny the reports.
The governor of Iran’s Kohgiluyeh and Boyer-Ahmad province said whoever captured the crew “would be specially commended”, according to the semi-official Iranian news agency ISNA.
Several US politicians acknowledged reports of the downed jet and expressed support for the US military.
“I’m praying for the safe return of the crew aboard the fighter jet and all of those working to rescue them in these dangerous conditions,” Senate Minority Leader Chuck Schumer said on the social media platform X.
Since the start of the war on February 28, the US has lost three F-15 fighter jets in what it said was a friendly fire incident over Kuwait. A US military refuelling aircraft also fell over Iraq last month, killing all six crew members.
Trump and his top aides have claimed multiple time that the US destroyed all of Iran’s air defences.
Reporting from Tehran, Al Jazeera’s Ali Hashem said Iranian officials have offered a reward for the downed pilots and called for locals to join in the search.
“The Iranians over the past days, since the March 19, been saying that they’ve introduced a new system that they developed after the 12 day war,” Hashem said.
Myles Caggins, a retired US Army colonel and non-resident senior fellow at New Lines Institute, called the downing of the jet a “significant event” for the US military.
“Iran’s primary air defence weapons were destroyed in the first days of the war through airstrikes or taken offline through sophisticated cyber attacks, but there are still manned portable air defence systems, and possibly that is the type of system that’s carried by one person that could have shot down this F-15,” Caggins said.
