Russian defense ministry

All four crew members on board died in the accident, according to Interfax.

Read alsoEvidence from downed Ukrainian flight poses more puzzles about crash – Radio Farda

Preliminary reports say technical malfunction that occurred as the helicopter was hovering at a 30-m altitude could be the cause behind the accident.

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Both flight recorders, almost undamaged, have been retrieved from the scene, Russian media report.

This is the second deadly crash involving a Mi-8 within a week.

Mash

On May 19, a similar accident took place outside Moscow, killing four crew members on board.