At least 59 people have been killed in an attack on a herding village in northeast Nigeria's Borno state, local militia members and residents told AFP news agency.
Fighters drove into remote Felo village in Gubio district on Tuesday afternoon, shooting fleeing residents, running them over with their vehicles and razing the village. The Reuters news agency reported that 69 bodies were recovered.More: Dozens of Boko Haram, ISWAP fighters killed in Nigeria Armed bandits kill at least 47 in Nigeria's Katsina state: Police The Sahel: Key things to know as security crisis spirals
No group has claimed responsibility for the attack.
The attack is believed to be a reprisal for the killing of fighters by local vigilantes protecting the villagers' herd from theft.
"It's an unfortunate day, for us to witness this," a Civilian Joint Task Force (CJTF) member, Kachallah Bumu told AFP.
While he said the residents were armed, and had repelled previous attacks, this one caught them off guard.
"They took us unaware and killed our people," he said.
The fighters had been stealing livestock from the village, prompting residents to form a militia force to end the theft, said another militiaman, Ibrahim Liman.
The vigilantes had been "hunting for the insurgents" in the bushes, killing some of them in gunfights, Liman said.
Gubio, 80 kilometres (50 miles) from the regional capital Maiduguri, has been repeatedly targeted by armed groups.
The incessant attacks prompted the authorities to send more than 100 vigilantes and local hunters to protect the town and nearby areas against incursions from armed groups, including Islamic State West Africa Province (ISWAP), which broke away from the Boko Haram armed group in 2016.
It has intensified attacks against the military in the last two years, repeatedly carrying out deadly attacks against soldiers. However, ISWAP's involvement in the latest attack has yet to be confirmed.
In recent months, there has been an increase in attacks on civilians blamed on the group.
The decade-long conflict has killed 36,000 people and displaced approximately two million from their homes in the country's northeast.
The violence has spread to neighbouring Niger, Chad and Cameroon, prompting a regional military coalition to fight the rebels.