Labour Undersecretary urged UN and other organisations involved in demining to ensure that all former battlefields were made free of unexploded ordinances.
Hellen Achiro Lotara sent condolences to the families of the deceased.
The Director-General for Labour and Industrial Relations Clement Philemon Baime denied media reports that the children who died were employed at the construction site.
He called on parents not to allow their children to do income-generating work because it would jeopardize their future.
Security Company Ordinance Manager Pierre Booyse warned members of the public against touching any strange objects they come across, but instead report such discoveries to security agencies.