Kyrgyzstan mourns plane crash victims
It is thought the plane had suffered decompression in the cabin shortly after takeoff from the capital Bishkek.
The jet was on its way to Tehran, the Iranian capital. Among those on board were Iranians, Canadians and Chinese.
The plane was operated by the private airline Itek Air and had been in service since 1979. It was said to be in a good state of repair.
Russian Prime Minister Vladimir Putin has sent condolences to his Kyrgyz counterpart.