|Sochi airport, crash happened shortly after a refuelling stop and subsequent take off.|
A single black box flight recorder has been recovered, from among the wreckage of a Russian military plane that crashed into the Black Sea, the Russian defence ministry has said.
Over 3,000 people have been involved in the search for victims' bodies and aircraft debris, with only some portions of the jet found.
The TU-154 crashed on Sunday. All other aircraft of this type have been grounding pending the outcome of investigations into the cause of the crash.
Julian Bray Aviation Security expert comments: Russian officials are repeatedly suggesting its either pilot error or a malfunction on board the aircraft. However many experts are of the opinion that it is too early for terrorism to be totally ruled out. They point to the debris field and the fact that human remains are already being recovered just days into the recovery operation. Clearly some form of 'catastrophic event' occurred exploding the aircraft thus creating the debris being recovered.
A day of mourning for the 92 people on board - including members of the army's world-famous choir - has been declared by Russian President Vladimir Putin.
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