Nigerien soldiers hold up a Boko Haram flag that they had seized in the recently retaken town of Damasak, Nigeria, March 18, 2015. Chadian and Nigerien soldiers took the town from Boko Haram militants earlier this week. The Nigerian army said on Tuesday it had repelled Boko Haram from all but three local government districts in the northeast, claiming victory for its offensive against the Islamist insurgents less than two weeks before a presidential election. Picture taken March 18. REUTERS/Emmanuel Braun - RTR4TZO2