The attackers carried out two attacks on a remote herding community in Zamfara.
According to a report by AFP, the gunmen attacked the remote village on motorcycles and killed 12 in the first attack before returning to kill three more while the first victims were being buried.
The spokesman of the Zamfara State police command, Muhammad Shehu, said, "Armed bandits attacked Bawon-Daji village yesterday and killed 15 people."
A senior local government official, Gado Anka, narrated how 12 had died in the initial attack before the second one that also left many injured.
He said, "They returned two hours later and attacked mourners during the funeral of the victims in the cemetery, killing three more and injuring several others."
Zamfara State is no stranger to savage attacks in 2018 as 41 people were killed after gunmen attacked residents of Birane village in Zurmi local government area of the state on February 14.