Nigerien pupils attend a lesson at a Koranic school in the south-eastern city of Bosso, on May 25, 2015. Niger has extended for three months the state of emergency in its southeastern Diffa region where the army has been battling Boko Haram militants since February, authorities announced on May 27, 2015.  The operation, nicknamed Barkhane, which succedeed to Serval one, is taking place across Mauritania, Mali, Burkina Faso, Niger and Chad and involves a total 3,000 French troops.  AFP PHOTO / ISSOUF SANOGO        (Photo credit should read ISSOUF SANOGO/AFP/Getty Images)