According to an eyewitness who spoke to the BBC, the vigilante group fought off an attack by Boko Haram, killing approximately 200 militants in the Kala-Balge district of Borno state.
The eyewitness also reported that vigilante members had seized cars and military vehicles from the militants.
Separately, Nigerian soldiers opened fire on the convoy of a senior military commander in Borno state out of frustration about poor pay and insufficient resources to counter Boko Haram. No one was injured by the incident.
Boko Haram has claimed responsibility for abducting more than 230 girls from their school in Borno state on April 15. Parents and families of the missing have criticized the Nigerian government for failing to dedicate sufficient resources to find the missing girls.