Sixteen civilians were killed in a village near the Niger town of Bosso on Wednesday after Boko Haram militants started shooting residents, a local official said on Saturday.
The militants fired on locals who were praying in a village near Bosso on July 15, Bako Mamadou, mayor of Bosso said.
“They killed 15 people on the spot and another person succumbed later to their wounds,” he said on state television.
The mayor also said another four people were wounded in the attack.
Boko Haram has recently ratcheted up its attacks, especially in the neighbouring Nigeria.
On Friday, the group killed nine people in Nigeria’s Damaturu as they were preparing for Eid prayers, an Islamic holiday marking the end of the holy month of Ramadan.
Boko Haram’s six-year-old uprising has claimed more than 15,000 lives, displacing over 1.5 million people inside Nigeria.
The recent upsurge in attacks comes despite the efforts by a four-nation military coalition formed to curtail the group’s activities.
The multinational force, comprised of Nigeria, Chad, Cameroon and Niger, has been able to push the militant group out of several regions.
However, Nigeria’s president Muhammadu Buhari will pay a visit to the United States on Monday in a bid to ask for more support in their fight against the group.
Meanwhile, the Niger army said on Saturday it killed 32 Boko Haram militants during a three-day-long operation which began on Wednesday.
In March, Boko Haram said it calls itself “West Africa Province” as it pledged allegiance to ISIS.