Seven men in central Vietnam are being probed after they were caught transporting three bombs from the Vietnam War era.
Police said the men, six from Quang Tri Province and another from the neighboring Quang Binh, had rented equipment to unearth bombs.
They found the bombs, each weighing around 230 kilograms, at five meters underground in Quang Tri. They then used a bulldozer to dig them up.
The men were caught carrying the bombs on a car early on Wednesday morning trying to sell them.
Police have seized the bombs and transferred them to RENEW, a Norwegian-funded ordnance clearance project in Quang Tri, which disposed them of the same morning.
An expert from the unit said the bombs were the highly destructive MK82 made by the US, each containing 80 kilograms of explosives.
Quang Tri was the hardest hit by the American bombings during the Vietnam War. The province was a center for American military bases during the peak of the war and a principle battleground during the 1968 Tet Offensive.
An estimated 400,000 pieces of UXO remain buried across 480,000 hectares of land in Quang Tri. They can be found in residential areas, gardens and even under the floors of houses.
Across Vietnam, UXO still threatens a fifth of land mass and explosions occur frequently, killing more than 1,500 people every year and maiming and injuring 2,200 more, according to official data.