The explosion left a three-meter deep pit at the site. Photo by VnExpress/Ngoc Thanh
The incident happened at a scrap facility in a residential area where many warheads have been found.
An explosion took place early Wednesday in Bac Ninh Province, killing two children, aged one and five, and leaving six others injured, said local officials.
The incident, which destroyed seven houses and unroofed another 10, took place at a scrap facility in a residential area in Yen Phong District, some 40 kilometers (24 miles) northeast of Hanoi.