Boko Haram jihadists killed 10 civilians in attacks on three villages in Borno, local security officials said Monday.
Babakura Kolo, the leader of a government-backed anti-jihadist militia, told AFP that insurgents had carried out the attacks on Sunday.
Kolo said they raided the village of Kurmari, 40 kilometers (25 miles) from the regional capital, Maiduguri, on Sunday night, killing four residents in their sleep.
The attackers did not use weapons to avoid attracting troops to a nearby town, said another member of the militia, Ibrahim Liman.
The area has been the target of repeated suicides and gun attacks.
Elsewhere, sources said jihadists burned three people alive and shot dead a fourth in another village on the outskirts of Maiduguri, also on Sunday.
Two farmers were also killed while tending their fields and several others were kidnapped near the city.
Boko Haram fighters have stepped up attacks on farmers as they work in their fields.
The jihadist conflict that began in 2009 has killed 36,000 people and displaced some two million in northeastern Nigeria.
The violence has spread to neighboring Niger, Chad and Cameroon, prompting a regional military coalition to fight the militants.
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