A man and two women blew themselves up when they were challenged by a member of the Civilian JTF, just outside Maiduguri. The blasts, in the village of Umariri about 7 kilometers (4 miles) from Maiduguri, occurred Saturday around 9 p.m. said Maiduguri police spokesman Victor Isuku.
"Four people which include a Civilian JTF, a woman and her two children died while eight others sustained injuries," he said.
It is the latest in a string of attacks in the last few days that bear the hallmarks of Boko Haram, which has killed about 15,000 people and forced more than 2 million people to flee their homes since 2009.
A man claiming to be the group's leader appeared in a video circulated Friday in which he claimed responsibility for bombings in Maiduguri and a raid on the nearby town of Magumeri last week. He also denied that 5,000 hostages held by the group had been freed.