A bomb weighing more than 150 kilograms was found in the northern province of Quang Ninh when a local man was digging the foundation of his house, Vietnamnet reported Thursday.
The bomb, unearthed at Hoang Van Quang's house Tuesday, was later deactivated by Ha Long Town's Military Command, according to the news website.
Initial investigations show that the one-meter-long bomb was probably dropped by US soldiers in 1972 during the Vietnam War, the news source said.
Meanwhile, border guards in the central province of Quang Tri Wednesday deactivated a bomb found by a resident in a field in Dak Rong District.
However, local agencies were yet to identify the rectangular-shaped bomb, Vietnamnet reported.
It quoted some people experienced in hunting for war weapon scrap as saying that the bomb would give out smoke and a bad odor lasting for months on contact.