It is not immediately clear whether the other three people on board the crashed helicopter survived. A helicopter carrying nine rescuers is expected to arrive at the site of the crash in a short time. This is the third reported crash landing involving Mi-8 helicopters in just a week. On Sunday, a Mi-8 helicopter crash landed in the Western Siberian Krasnoyarsk region after its engine failed. There were four people and 2 tons of cargo on board the aircraft, which was not damaged. Another Mi-8 helicopter crash landed on July 12 in the northern Komi Republic with no casualties. The production of multipurpose Mi-8 helicopters started in 1965 in the city of Kazan. As of 2010, more than 10,000 Mi-8 helicopters have been produced, and more than 2,000 exported to some 40 countries.