While digging foundation of a house in Tuy Hoa City in the central province of Phu Yen on March 14, a group of building workers discovered deep underground -- 85 grenades, 15 bullets and some explosives.

In a coffee shop, a man named Moel took a grenade from his pocket to toss in his hand, but the grenade fell to the ground and exploded. A 9th grade student sitting close to Moel was killed and four others were injured.