Maina Ularamu, local government chairman of Madagali told AFP, in the north of Adamawa state, said the attack happened early on Friday morning in Pambula-Kwamda village.
"The attackers went into the village around 4:00 am (local time) while residents were still asleep and used machetes to attack their victims," he added.
News of the attack only emerged today because of the remote location and communications difficulties caused by the insurgency.
The attack is the latest by Boko Haram in northern Adamawa state, which was declared "clear" of insurgents in March by the military.
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Yesterday, 31 people -- most of them children under 12 -- who were freed last week were brought to the Malkohi camp outside the northeastern city of Yola, relief officials said.
Today, defence spokesman Chris Olukolade said troops had thwarted an attack on Mafa, 50 kilometres east of the Borno state capital, Maiduguri.