But Ibrahim Liman, of the civilian militia force assisting the military against Boko Haram, said two more victims died on the way to the hospital in Maiduguri, raising the death toll to five.
The attack came two weeks after five militia members were killed by a male bomber who detonated explosives concealed on him at a checkpoint outside Konduga.
Boko Haram’s nine-year violence to create a hardline Islamic state has killed 20,000 people and displaced 2.6 million from their homes in Nigeria.
The violence has spilled into neighbouring Niger, Chad and Cameroon.