The horrifying moment a doomed Russian plane smashed into the ground killing 71 passengers appears to have been captured on film.
Chilling CCTV footage shows a blaze followed by a train of smoke disappearing into a snowy landscape.
It is unclear if this is the main body of the aircraft or a part of the wreckage which has broken off.
The footage may give vital clues to crash experts seeking an explanation for the tragedy.
At the crash site, the debris is mainly small pieces strewn over a large area, while the bodies of passengers and crew are "unrecognisable", Russian officials say.
Authorities are preparing DNA tests for grieving relatives.
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