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.

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