HANOI, Vietnam (AP) — A mortar shell left from the Vietnam War has exploded in a southern village, killing four children and seriously injuring five other people.

Hieu Nghia village official Le Van Giang says three children aged 4 to 11 died at the scene Sunday afternoon and a 6-year-old boy died at the hospital. The blast seriously injured two other children and three men.

Giang said the shell exploded when the children who found the shell from bamboo brush were playing with it. A villager found the shell five years ago when dredging a canal.

The village in Vinh Long province was a communist stronghold during the war.