Residents of a Nigerian village on the shore of Lake Chad say at least 50 residents are missing after a raid by suspected Boko Haram militants.
A witness told the BBC that 26 people were also killed during the raid on the village of Doron Baga on Sunday.
The remote region has poor communication links, meaning news of the raid took days to emerge.
Nigeria has been plagued by attacks by the Boko Haram Islamist group in recent years, particularly in the north-east.
In April, Boko Haram caused global outrage by abducting more than 200 girls from their boarding school in the remote down of Chibok in Borno state.
It is unclear exactly how many people were seized during the attack.
Some of the villagers tried to fight the attackers off, but they were unable to stop the raid, a villager elder told the BBC's Hausa service.
The militants then burnt down some houses and rounded up a group of 50 people, he said.
They were mainly women but also included some boys and girls, he added.
Other survivors say young men were also taken possibly to be turned into Boko Haram fighters.
Witnesses from the village told reporters about the attack after reaching the state capital of Maiduguri.
The Nigerian military has not commented on the attack.