Investigators looking into Sunday's passenger plane crash in Russia have linked iced speed sensors to the accident.
The Saratov Airlines jet went down just minutes after taking off from an airport near Moscow, killing all 71 people on board.
After studying the flight recorder, Russia's Interstate Aviation Committee said instruments began displaying different speed readings.
The committee also noted that the pilots may be to blame as they failed to turn on the heating unit for the plane's measuring equipment prior to take off.