All possible causes of the Russian military plane disaster are being considered, including terror attack, the Russian transport minister has said.
Earlier, a Russian official had downplayed any suggestion of a terror attack.
But Maxim Sokolov said an "entire spectrum" of possible reasons is being considered.
However he added it's premature to speculate about the cause of Sunday's crash.
The Tu-154 plane belonging to the Defense Ministry crashed into the Black Sea two minutes after taking off from the Russian city of Sochi on Sunday morning.
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