CHAD-NIGERIA-UNREST-CAMEROON(01 of18)
Open Image ModalChadian troops gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(02 of18)
Open Image ModalChadian troops gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(03 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(04 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(05 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(06 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
NIGERIA-CHAD-UNREST(07 of18)
Open Image ModalA 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) (credit:STEPHANE YAS via Getty Images)
NIGERIA-CHAD-UNREST(08 of18)
Open Image ModalCopies of the Quran and other texts written in Arabic are seen in an abandoned Boko Haram command post in Gamboru deserted after Chadian troops chased them from the border town on February 4, 2015. AFP PHOTO/STEPHANE YAS (Photo credit should read STEPHANE YAS/AFP/Getty Images) (credit:STEPHANE YAS via Getty Images)
CHAD-NIGERIA-UNREST-MEDIA(09 of18)
Open Image ModalChadian newspapers with headlines pertaining to Chad\'s military intervention against Nigerian Islamist group Boko Haram reading \'Look out Deby is coming!\' (L), \'Chadian army combs through Gambaru\' (R) are displayed on February 2, 2015 in N\'Djamena. Chadian aircraft struck Boko Haram positions in the Nigerian border town of Gamboru for a second straight day on february 1, an AFP journalist in a neighbouring town said. Three Chadian soldiers and 123 Boko Haram fighters were killed in two days of clashes in northern Cameroon earlier this week, according to Chad\'s military. AFP PHOTO / SIA KAMBOU (Photo credit should read SIA KAMBOU/AFP/Getty Images) (credit:SIA KAMBOU via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(10 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(11 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(12 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(13 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(14 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
CHAD-NIGERIA-UNREST-CAMEROON(15 of18)
Open Image ModalChadian soldiers gather on February 1, 2015 near the Nigerian town of Gamboru, just accros the border from Cameroon. In a deserted Gamboru, Chadian forces carried out clean-up operations after entering the town and retaking it from Boko Haram, which seized control months ago. AFP PHOTO / MARLE (Photo credit should read MARLE/AFP/Getty Images) (credit:MARLE via Getty Images)
NIGERIA-CHAD-UNREST(16 of18)
Open Image ModalA picture taken on February 3, 2015 shows Chadian and Cameroonian soldiers trying to cross the El Beid bridge, which separates Fotokol from Gamboru. Chadian troops took control of the Nigerian border town of Gamboru on February 3 after launching a ground offensive against the jihadist Boko Haram group, an AFP journalist reported. AFP PHOTO / STEPHANE YAS (Photo credit should read STEPHANE YAS/AFP/Getty Images) (credit:STEPHANE YAS via Getty Images)
NIGERIA-CHAD-UNREST(17 of18)
Open Image ModalChadian soldiers patrol in the Nigerian border town of Gamboru on February 4, 2015, after taking control of the city. Around 2,000 Chadian troops backed by armoured vehicles poured across the border into Gamboru on February 3 after the African Union last week backed a regional force to take on the extremists. AFP PHOTO / STEPHANE YAS (Photo credit should read STEPHANE YAS/AFP/Getty Images) (credit:STEPHANE YAS via Getty Images)
NIGERIA-CHAD-UNREST(18 of18)
Open Image ModalA picture taken on February 4, 2015 shows motorcycles left by Boko Haram Islamist militants in Gamboru, after Chadian soldiers took control of the Nigerian border town. Around 2,000 Chadian troops backed by armoured vehicles poured across the border into Gamboru on February 3 after the African Union last week backed a regional force to take on the extremists. AFP PHOTO / STEPHANE YAS (Photo credit should read STEPHANE YAS/AFP/Getty Images) (credit:STEPHANE YAS via Getty Images)