VIENTIANE, Jan. 24 (Xinhua) -- A military trainer was killed and 30 students were injured when a hand grenade accidentally exploded during a demonstration of how to properly use grenades at Xay District Secondary School, Lao northern Oudomxay Province, some 360 km northwest of capital Vientiane.
The tragic event happened at about 9:00 a.m. local time on Tuesday, reported Lao state-run news agency KPL.
