The victims were killed on Saturday afternoon when scores of suspected bandits raided Gwaska village, in Birnin-Gwari area of Kaduna state, Xinhua reported.
The group, Birnin-Gwari Vanguards for Security and Good Governance, said 45 bodies were recovered by vigilantes and volunteers with the assistance of soldiers on Sunday afternoon.
The attack came barely a week after the killing of 14 miners at a mining site at Janruwa area of the same state.
The bandits, on motorbikes, stormed the Gwaska village via Zamfara state, said Bala Abdulahi, a member of the vigilante group.
The bandits shot sporadically and killed anybody in sight, Abdulahi said.
Confirming the incident, the state government said a battalion of the Nigerian Army would be permanently stationed in the area to halt the killings.
State Governor Nadir el-Rufai said he has been engaging with the federal government on the matter and that he has directed the State Emergency Management Agency to provide relief materials to those affected.