The crash of a Russian passenger jet carrying 71 people outside Moscow on Sunday is the latest in a number of recent deadly Russian air disasters.
Investigators said debris and human remains were spread across 1 kilometer at the crash site, Reuters news agency reports.
The jet was heading toward the city of Orsk close to the border with Kazakhstan.
The flight recorder and parts of fuselage have been found and sent for analysis to determine cause of the crash, the office added.
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The governor of the Orenburg region, where the plane was flying to, told Russian media that "more than 60 people" onboard the plane were from the region.
Reports said witnesses in the village of Argunovo saw a burning plane falling from the sky.
The Tass news agency says the plane fragments were found in the Ramenskoye area about 25 miles from the airport.
The domestic plane was being operated by Saratov airlines, and had 65 passengers on board, along with six crew members. Emergency services said in a statement that more than 150 rescue workers had been deployed.
Video from the crash site appears to show pieces of wreckage in a snow-covered field.
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The Russian-made plane was seven-years-old at the time of the crash and the airline purchased it about a year ago.
Russian Transport Minister Maksim Sokolov flew to the site.
All those on board are thought to have died, officials told Russian media.
Saratov Airlines, a regional carrier, had no crashes until Sunday. Putin was to meet Monday with Palestinian leader Mahmoud Abbas at the Black Sea resort, where the president has an official residence.
The crash was the first major air disaster in Russian Federation since December 2016, when a Defense Ministry-operated jet enroute to Syria from Sochi crashed into the Black Sea.
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The plane's wreckage lies in Stepanovskoye village, about 40km from where it took off.