The exact toll from the ambush on the main road between Maiduguri to Damboa on Saturday was unclear, with numbers varying from two to as high as 15 and 24.
But according to travellers who survived the attack and local rescuers, at least 15 trucks laden with food were seized when the Islamists struck at the Korowaso forest on Saturday.
"The attackers appeared from the bushes as the convoy slowed down at a part of the road riddled with potholes and opened fire on the vehicles," said one of the drivers, Idrissa Kyari told AFP.
Two students from of University of Maiduguri were killed in the attack with three others injured, said a teacher at the university on condition of anonymity.
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Masida Umar, a civilian vigilante assisting the military against Boko Haram, said: "We evacuated 24 dead bodies and several injured to hospital.
"Many people fled into the bush and have not been seen despite deployment of a search team."
Umar said there were fears Boko Haram may have captured those who fled.