The attacks bring the official toll to 10 troops killed and 24 wounded this past week after a lull during which the extremists confronted a leadership struggle. The Islamic State group's West Africa Province claimed more than 40 soldiers from a multinational army were killed in one attack last week.
Extremists attacked an army position Sunday at Logomani, 110 kilometers (70 miles) northeast of Maiduguri, northeastern Nigeria's biggest city, an army statement said. The troops killed 22 fighters while losing four soldiers, it said.
Bama is a remote desert post where Borno state Gov. Kashim Shettima has set up temporary headquarters to encourage displaced people to return home and to speed up reconstruction of the town destroyed when it was occupied for months by extremists.
Also on Sunday, longtime Boko Haram leader Abubakar Shekau appeared in a video denying military reports that he was fatally wounded last month. The Islamic State in August appointed a new leader in Nigeria, but Shekau has insisted he remains in charge.
"To the people of Chibok: You have not seen the worst yet," Shekau says, ending with gales of laughter.
Nigeria's military called the video "the handiwork of a mentally sick and unstable mind." The military several times in the past has claimed to have killed Shekau, only to have him reappear.
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