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A Boko Haram flag flutters from an abandoned command post in Gamboru deserted after Chadian troops chased them from the border town on February 4, 2015. Nigerian Boko Haram fighters went on the rampage in the Cameroonian border town of Fotokol, massacring dozens of civilians and torching a mosque before being repelled by regional forces. AFP PHOTO/STEPHANE YAS        (Photo credit should read STEPHANE YAS/AFP/Getty Images)
A Boko Haram flag flutters from an abandoned command post in Gamboru deserted after Chadian troops chased them from the border town on February 4, 2015. Nigerian Boko Haram fighters went on the rampage in the Cameroonian border town of Fotokol, massacring dozens of civilians and torching a mosque before being repelled by regional forces. AFP PHOTO/STEPHANE YAS        (Photo credit should read STEPHANE YAS/AFP/Getty Images)

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    Who are Boko Haram?

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Who are Boko Haram?

CNN's Stephanie Busari explains how the Nigerian terrorist group Boko Haram gained notoriety.

Who are Boko Haram?

CNN's Stephanie Busari explains how the Nigerian terrorist group Boko Haram gained notoriety.