Eight militiamen were injured when a grenade exploded during an exercise in the central province of Nghe An Tuesday.
The accident happened at around 4 p.m. when militiamen of Thanh My Commune in Thanh Chuong District were collecting fake grenades used for the military exercise before taking a break.
But one grenade exploded suddenly, injuring eight people, five of them seriously.
All victims are being treated at hospital. Four victims a woman and three men were transferred to a hospital in Hanoi for treatment.
Twenty-two militiamen had joined the regular exercise held by Thanh Chuong District's army unit. They were being trained to throw grenades.
It has not been explained why a genuine grenade was up with the fake ones.
The accident is being investigated further.