HANOI: Sixteen people were killed and five injured when a Vietnamese military helicopter crashed in the capital Hanoi early on Monday during a training exercise, a top military official said. “The plane was carrying 21 people and it crashed during a parachute training exercise, killing 16 and injuring five others,” Lieutenant General Vo Van Tuan, army deputy commander, told Agence France-Presse. The dead and injured were all military personnel, he added. “According to our preliminary investigation, the accident was due to technical problems. The weather was good and I can say that there was no act of sabotage,” he added. The Russian-made Mi-171 chopper came down in the early morning in the Thach That district, a sparsely-populated rural suburb in the west of the city.