A
Russian SU-34
bomber crashed in the
Caucasus
mountains during a routine
training flight
likely due to a technical malfunction, killing the crew aboard, Russian news agencies reported on Tuesday, citing the defence ministry.
"The preliminary cause of the plane crash is a technical malfunction," TASS state news agency cited the ministry's representative as saying.
The crash took place in the
Ossetia region
, the ministry said.
It was not immediately known how many people were on board.