PeaceTrees, said the massive bomb, 2.17 metres long and 30 centimetres in diameter, discovered on the banks of the Se Ming Hieng River in central Quang Tri Province by local people, could have exploded anytime.
Quang Tri, which straddles the former Demilitarized Zone that formed the de facto border between north and south Vietnam during the war, is the country's worst-affected province for unexploded ordnance.
More ordnance was dropped on Quang Tri than all the bombs dropped in Europe in World War II, said PeaceTrees. There's tons of the stuff still under the ground, everything from pear-size M-79 rounds to 500-pound bombs.
PeaceTrees has established a centre in Dong Ha, the Quang Tri capital, to educate children and adults about the dangers. At the same time, PeaceTrees and two European groups are working to remove mines and unexploded ordnance throughout the country.