This handout photo taken and released by the Russian Emergency Ministry on February 13, 2018, shows emergency rescuers working at the site of plane crash in Ramensky district, on the outskirts of Moscow. The Antonov An-148 plane went down in the Ramensky district around 70 kilometres (44 miles) southeast of Moscow after taking off from Domodedovo airport in the Russian capital and disappearing off the radar at 2:28 pm (1128 GMT) on February 11. "Sixty-five passengers and six crew members were on board, and all of them died," Russia's office of transport investigations said in a statement. Pic/AFP

The pilots of the Russian airliner, which crashed on February 11, have been blamed for the accident. According to the investigators, the pilots failed to switch on a heating unit, which led the speed sensors to ice up and provide wrong information. "A factor in the development of a special situation in the flight could be the wrong data about flight speed on pilots' indicators which was likely due to iced pitot tubes (speed probes) while their heating systems were shut off," The New York Post quoted the Russian Interstate Aviation Committee as saying.