The jihadist group also claimed an assault on a high-security prison near the capital of Niamey.
French forces reportedly killed dozens of jihadists after a three-week long operation in central Mali.
The Islamic State issued several claims of responsibility for attacks by the group known as the Islamic State in the Greater Sahara (ISGS) in Mali, Burkina Faso and Niger.
Human Rights Watch has documented dozens of civilians who have been murdered by both jihadists and government forces in Burkina Faso. This helps exacerbate the conditions that allow jihadists to operate in the region.
The jihadist conglomerate, as suspected, claimed Sunday’s deadly siege on a military base in central Mali.
While no group has yet to officially claim the assault, al Qaeda’s Group for Support of Islam and Muslims is widely suspected.
Al Qaeda’s Group for Support of Islam and Muslims directly refutes France’s claiming of killing one of its co-founders and senior leaders, Amadou Kouffa.
The claim has not been confirmed elsewhere, nor has JNIM commented on the event, but the French military has claimed a recent operation killed JNIM co-founder Yahya Abu al Hammam.