At least 10 people were feared killed in a Mi-8 helicopter crash in northern Krasnoyarsk region on Thursday.
The West Siberian Transport Prosecutor's Office said latest data showed that 10 people were killed in the crash, while 15 others had been shifted to hospital.
Russia's Emergency Situation Ministry confirmed there were altogether 25 people aboard the helicopter, including three crew members and 22 passengers.
The helicopter, en route to an oilfield in the region, crashed near the airport of Igarka and was found lying on the bank of the Yenisey River.
The cause of the accident is yet to be ascertained.
Interfax news agency, however, quoted an unidentified source from emergency services as saying that it could be a technical malfunction.
