A passenger plane carrying 105 people crashed in a snowy and mountainous region of northwestern Iran on Sunday, news agencies in the country reported.
Several people suffered severe injuries but at least 50 people have been rescued, the news agencies said.
At least 10 people with severe wounds were hospitalized, an emergency services official, Mojtaba Khalebi, said, according to the semi-official Iranian Labor News Agency.
""The number of dead has not yet been determined because the priority is to save those that have been injured first,"" the news agency quoted him as saying. ""Not all of the passengers have been killed. A number are still alive.""
Severe weather at the crash site is making rescue operations difficult, he told the news agency.
Fifty to 60 people were taken from the plane with injuries, the Mehr news agency quoted Gholareza Masoomi, the head of Iran's Emergency Services, as saying.
An IranAir passenger jet crashed Sunday in the country's northwest, breaking the aircraft into several pieces. Around half of the 95 people on board survived with light injuries, but heavy snow hampered rescue efforts, Iranian media reported.
The Boeing-727 operated by Iran's national airline crashed shortly before it was to land in the city of Orumiyeh, 460 miles (700 kilometers) northwest of the capital, Tehran, said Abbas Mosayebi, spokesman of the Iranian civil aviation organization, state TV reported.
The semiofficial Fars news agency quoted the head of the State Emergency Canter, Gholam Reza Masoumi, as saying 50 people survived with light injuries. There was no information on the fate of the others.
Masoumi said heavy snow was complicating rescue efforts. That report also said there was fog in the area.
The plane was broken into several pieces, but there was no explosion or fire, said Mahmoud Mozaffar, head of the rescue department of Iran's Red Crescent Society, speaking on state TV.
Iran has a history of frequent air accidents blamed on its aging aircraft and poor maintenance. In July 2009 a Russian-made jetliner crashed in northwest Iran shortly after taking off from the capital, killing all 168 on board.
In February 2003 a Russian-made Ilyushin 76 carrying members of the Revolutionary Guard crashed in the mountains of southeastern Iran, killing 302 people aboard.
IranAir's fleet includes Boeing and Airbus aircraft, many of them bought before the country's 1979 Islamic Revolution. The airline also has some Russian-made Tupolev-145 jets.