Nigeria's former national security adviser Sambo Dasuki (center) arrives at the Federal High Court in Abuja on Dec. 14 for a hearing on charges of possessing weapons illegally. Olamikan Gbemiga /AP hide caption

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Cameroonian soldiers stand guard at a lookout post on Feb. 25 as they take part in operations against the Islamist extremist group Boko Haram in northern Cameroon, near the border with Nigeria. Edwin Kindzeka Moki/AP hide caption

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People gather to look at a burnt car following a bomb explosion that rocked a roundabout near the crowded Monday Market in Maiduguri, Nigeria, on July 1, 2014. The city has been repeatedly hit by Boko Haram terrorists. A recent report found that in 2014, the group was responsible for more known deaths from terrorism than any other organization. Stringer/AFP/Getty Images hide caption

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Lami Musa, 27, cradles her 5-day-old baby girl at a refugee camp clinic. One of the women rescued from Boko Haram, she says her husband was killed before she was abducted by Islamist extremists. Sunday Alamba/AP hide caption

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Campaigners marched Monday in Nigeria's capital of Abuja during a silent protest to raise awareness about girls and boys abducted by Boko Haram. Sunday Alamba/AP hide caption

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No one knows how many children have been affected by the spread of Boko Haram across Nigeria and neighboring countries. This photo shows the school uniforms of the girls kidnapped from a school a year ago. Glenna Gordon/Glenna Gordon for NPR hide caption

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Nigerian electoral officials collate results at a polling station in the oil rich Niger Delta, Port Harcourt, Nigeria on Sunday. Millions of voters headed to the polls in the Nigerian general elections after being delayed for over a month. Tife Owolabi/EPA/Landov hide caption

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Nigeria's President Goodluck Jonathan, left, and opposition candidate Gen. Muhammadu Buhari, right, prepare to sign a renewal of their pledge to hold peaceful "free, fair, and credible" elections, at a hotel in the capital Abuja, Nigeria, on Thursday. Ben Curtis/AP hide caption

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Nigerian President Goodluck Jonathan speaks during the inauguration ceremony of the 750 megawatt power station in the southwestern Ogun state, Nigeria, last month. In an interview with the BBC Friday, he said he hopes to retake all territory seized by Boko Haram within a month. Jiang Xintong/Xinhua/Landov hide caption

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The most recent propaganda videos from Boko Haram have higher production values than in the past and other similarities to ISIS-produced videos. Boko Haram/Sendvid hide caption

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