Russian News Agencies claim the aircraft received a lightning strike causing a total electrical failure and subsequent return and a hard landing.
Russia's Emergency Ministry originally claimed all occupants had evacuated the aircraft and were accounted for.
Local hospitals report more than 10 people on board of the aircraft are being treated.
Moscow's Interregional Transport Prosecution Office opened an investigation into the emergency landing at Moscow Sheremetyevo. The office initially confirmed one fatality, later confirmed 13 fatalities including two children.