"The plane was a cargo Boeing 707 that overshot the runway during its landing", Iran's aviation organisation spokesman Reza Jafarzadeh told state broadcaster IRIB.
An Iranian air force cargo plane landing at the wrong airport crashed outside Tehran, killing 15 people on board, state-run Fars news agency reported.
The army's statement came after some confusion over who owned the plane.
A fire engulfed the plane immediately after the crash in the town of Safadasht on Monday, about 50 kilometres southwest of Tehran.
TV said rescue teams had been sent to the area, between the airports of Fath and Payam.
Fars said the plane crash-landed after "mistaking the airport with another airfield because of the bad weather".
The Boeing 707 cargo plane that crashed in Iran on Monday belongs to Kyrgyzstan, Iranian state TV reported.
Iranians often use the word "martyrdom" for those who die in war or national service, suggesting the aircraft may have belong to the air force.
Authorities initially said they feared all on board had been killed, but reports afterward said one crew member was taken to a local hospital.
City can't afford £100m Ruben Neves, says Pep Guardiola
Oil down but set for weekly gain amid caution over global economy
Islamic State 'living its final moments': US-backed forces
Security forces fire tear gas as more protests hit Sudan
The final 'Game of Thrones' season airs April 14
California's "Rising Star" Cop Responded To Accident, Killed By Gunman
Mobile gambling market set to be worth 100 Billion by 2017
An egg dethrones Kylie Jenner's most-liked Instagram post
Uri Day 3 in overseas
Netanyahu Admits Israel Behind Strike Against Iranian Weapons Depots in Syria
Movies with heroes who play roulette
Game Of Thrones Season 8 Premiere Date Revealed In Cryptic New Video
The main reasons why your bet can loose
College basketball player on many NBA wish lists could have been playing illegally
Griffin scores 44 points in emotional LA return
Jets vs Steelers, odds and predictions
Alexandria Ocasio-Cortez Schools Joe Lieberman Over Remarks That She’s Too ‘Controversial’