The plane reportedly was carrying a cargo of meat from Bishkek, Kyrgyzstan's capital, to Iran.
A Boeing 707 cargo plane with at least nine people on board crashed in bad weather on Monday west of the Iranian capital, the semi-official Fars news agency reported, adding that there was no immediate information on casualties.
It is not clear who owned the plane.
The airport is located near Karaj in the central province of Alborz.
Rescuers say the bodies of seven people have been recovered with searches continuing.
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Yet a spokeswoman for Kyrgyzstan's Manas airport said the plane belonged to Iran's Payam Air, Reuters reported.
Iran's air force said in a statement that the fate of the crew, including their possible 'martyrdom, ' is under investigation.
But a source told Fars agency that the plane belonged to the Iranian military's air force. Images carried by Iran's state-run media showed the burned-out tail of the plane sticking out, surrounded by charred homes.
It was later confirmed it belonged to Iran's 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.