The President stated this on Saturday in a statement signed by his Senior Special Assistant on Media and Publicity, Garba Shehu.
He also condemned attacks against non-indigenes and law enforcement officials by terrorists in the region and called on citizens to point out the perpetrators for prosecution.
The President was reacting to reports of the beheading of six Nigerien citizens and the brutal killing of some policemen at their duty posts.
Buhari urged community and religious leaders to speak more forcefully against the killings, stand up and defend the ethos of “our cultural and religious heritage.”
He vowed to take all possible action in conducting a speedy investigation to bring the perpetrators to justice.
“Those who know should point at specific people who did this,” said Buhari.
While offering his condolences to the families of the deceased, President Buhari also expressed his regime’s unwavering commitment to peace and stability in the southeast and the entire country.
He stressed that the reports of killings anywhere were sad and unwelcome, further sympathised with the government and people of Niger Republic whose citizens were cruelly beheaded.