Unidentified assailants attacked people attending a funeral at a cemetery, before going on to the village where they "shot at everyone they saw," an official says.
A UN investigation report said that a wedding had in fact taken place and had "gathered about 100 civilians at the site of the strike." France rejected the findings, saying it had killed armed militants.
Local officials say France's Operation Barkhane killed six civilians who had gone to hunt birds and rabbits in remote Gao region, but French forces claim they targeted militants.
Local residents of the village of Talataye said six young people were buried after a strike which occurred when they were "on board three motorcycles and armed with a hunting rifle to shoot rabbits and partridge."
Government spokesman Abdourahmane Zakaria confirmed that the latest killings took place on the same day Niger's Constitutional Court officially declared Bazoum as the winner of February's election.
French President Emmanuel Macron has said military operations should keep focusing on the region bordering Mali, Niger and Burkina Faso in a summit with West African leaders.
Chad calls for international support to help Africa's beleaguered Sahel region as leaders of Burkina Faso, Mali, Mauritania, Niger, and France attend summit in Chadian capital N'Djamenaas to discuss future of their military operation.
No group has claimed responsibility for the attack, but militants linked to Al Qaeda and Daesh group stage regular attacks on UN peacekeepers and soldiers.
The victim's bodies were brought back from Mopti region to the airport in Sevare, near the town of Mopti, by a helicopter from the UN's MINUSMA peacekeeping force, while the injured were taken to hospital, local officials said.
National Committee for the Salvation of the People is dissolved, says a government decree, a decision that comes after more than five months of president Ibrahim Boubacar Keita's removal in a coup.
Officials says around 30 attackers were killed in the "complex and simultaneous" attacks while some 40 motorcycles and a large amount of military gear were also seized from the militants.
Their deaths brought to 50 the number of French soldiers killed in the nation since France first intervened in 2013.
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