Nigeria counts votes in closely-fought presidential election even as voting continues in some units where polling opened late or ballot machines malfunctioned.
Military sources said the attack targeted the Forward Operation Base in Ngwom village, some 14 km north of the Borno state capital, Maiduguri.
In the city of Maiduguri, where the militant group was formed, Islamic scholars and community leaders are trying to contain the group's violent message with a curriculum based on peace.
The released children were among 1,175 boys and 294 girls who had been identified as being associated with the Civilian Joint Task Force in the city of Maiduguri, UNICEF said, although the total has yet to be verified.
With tens of thousands of people fleeing Boko Haram atrocities and taking refuge in urban centres, real estate prices have spiked, allowing developers to make huge profits.
Two blasts ripped through the town of Damboa in Borno state on Saturday evening targeting people returning from celebrating the Eid al Fitr holiday, in an attack bearing all the hallmarks of Boko Haram.
The attack near the northeastern city of Maiduguri overnight also wounded dozens of others.
Boko Haram kidnapped 110 girls from a school in Dapchi, four weeks ago. Leah Sharibu, 15, was held back on Wednesday when 105 of her classmates were freed by Boko Haram after negotiations.
Three suicide bombers targeted a fish market in the northeast city of Maiduguri, the epicentre of the Boko Haram insurgency. Nobody has claimed responsibility for the attack so far.
No group has immediately claimed responsibility for the attack, but Boko Haram is seen as the prime suspect.
Most of the victims belong to a camp for internally displaced people, who are trying to escape Boko Haram violence. The total number of suspected cholera cases in the country stands at 186, according to the health ministry.
As many as 16 reported to have died in bomb blasts in Nigeria's north. No group claimed responsibility for the attacks in an area that has been wracked by violence brought about by the Boko Haram insurgency.
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