Dauran said the kids began to play with it, and shortly after, it exploded.
While six were killed instantly, others were left with various degrees of injuries.
Those who sustained injuries were immediately rushed to a hospital in Gusau, the state capital for medical attention.
Dauran said he later got information that one person among the victims that were hospitalized also died.
He said the state had put measures in place to prevent future occurrences of such.
The Commissioner for Internal Security and Homes Affairs in the state, Samuel Aruwan, in a statement issued on Tuesday, said the seven children injured by the explosion are now receiving treatment at the Ahmadu Bello University Teaching Hospital, Shika.
He expressed the alarm at the incident, adding that Governor Nasir El-Rufai stated his relief that the injured children were receiving treatment.
Aruwan tasked security agencies to conduct a detailed investigation into the incident and urged citizens to increase their vigilance towards the presence of such items around inhabited locations.
He further added that security agencies have been duly informed of the incident for thorough investigations, to forestall future occurrences.
In another incident, he said armed bandits barricaded the road from Sabon Birni to Rikau in Igabi Local Government Area and killed one Ibrahim Abdulmumin, a resident of Rikau village.
While One Sahabi Shafiu, son of the village head of Rikau, was also injured.
He said both victims were returning from the weekly market at Sabon Birni when they were intercepted by the bandits.
Also, Aruwan said armed bandits attacked Akwando village in Kachia Local Government Area, and killed one Elder Dikko Bagudu, a resident of the community.