Speed sensors that were iced over may have caused a passenger jet to crash near Moscow, killing all 71 people on board, investigators say.
The faulty instruments could have indicated wrong speed data, Russia’s Interstate Aviation Committee said.
The Saratov Airlines jet went down minutes after take-off from Moscow’s Domodedovo airport on Sunday.
No emergency call came from the plane. The Antonov An-148 was en route to Orsk in the Ural mountains.
More than 700 people are involved in the search operation, struggling through deep snow.
The emergencies ministry is collecting DNA samples from victims’ relatives in order to identify the victims.