Governor of the Diffa border region, Dan Dano Mahaman Laouali, told Niger public radio the attack took place on Friday.
Boko Haram kills 10, abducts 13 near Chibok
Tens of thousands of Nigeriens fled the region in June after Boko Haram attacked a military post in Bosso, a town in Niger near the border with Nigeria and Chad, killing 26 soldiers.
Boko Haram elusive leader Shekau says 'still around': audio message
Boko Haram is headquartered across the border in northeastern Nigeria and seeks to carve out an emirate and impose a strict interpretation of Islamic law.
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