Saratov Airlines flight 703, from Moscow's Domodedovo airport to the city of Orsk on the Kazakhstan border, was carrying 65 passengers and six crew members, a Federal Air Transport Agency spokesman said on Rossiya-24 television. The plane lost radio contact seven minutes after takeoff, the spokesman said.
The cause of the crash was not immediately clear. None of the people aboard the Antonov An-148 jet were believed to have survived, the Interfax news agency quoted an emergency-service source as saying.
Authorities spotted the wreckage in a field outside Moscow, the RIA Novosti news agency said. Witnesses reported seeing a falling airplane in flames, Interfax said.