A pilot error or a technical fault is likely to be the cause of Sunday's plane crash, the Russian transport minister said on Monday.
Maxim Sokolov told television reporters that terrorism was not suspected.
He reiterated comments from Sunday afternoon in which he said an "entire spectrum" of possible reasons is being considered for the Tu-154 crash.
But several experts noted factors that could suggest a terror attack, such as the crew's failure to report any malfunction and the fact that plane debris was scattered over a wide area.
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