Initial investigations showed the crash was caused by technical failure.
Death toll has risen to 18. Authorities earlier put it at 16.
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| The helicopter exploded after hitting the ground. |
The helicopter which was on a parachute training mission lost control shortly after taking off from Hoa Lac airport. The aircraft was said to lost altitude and hit the ground before exploding near a local market.
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| Local people help with search and rescue work |
There were a total of 21 people on board. Sixteen soldiers were confirmed dead at the scene and five others were injured and admitted to military hospitals.
However, three more soldiers died in hospitals, and the other two were in critical condition.
