At least two children have died and eight people injured in an explosion at a scrap warehouse in Bac Ninh province, east of capital city Hanoi, according to state-run Vietnam News Agency.
The explosion took place early in the morning, and as well as destroying the warehouse, damaged five neighbouring houses, according to local district authorities in Yen Phong.
The blast left a crater 20m long and 4m wide in the floor of the warehouse.
The sale of unexploded bombs used during the Vietnam War continues to be a source of income for many families and has caused more than 40,000 deaths and 60,000 injuries in accidents since the end of the conflict in 1975.
Around 10 per cent of the 7.8 tons of explosives that the United States army dropped did not detonate, according to the US Department of State.
