Associated Press KAOLACK, SENEGAL? Dozens of armed security forces descended on the Quranic school at night, arresting an imam suspected of having links to Islamic extremists in Nigeria. As the forces encircled the home of Imam Alioune Badara Ndao, 300 boys from his boarding school ran into the dirt courtyard, panicked at the sudden appearance of the gendarmes in this peanut-industry town. More arrests were carried out in the weeks that followed, including of three other imams accused of supporting Boko Haram, stoking fears that extremism could be sprouting in this predominantly Muslim, moderate nation that prides itself on its tolerance and co-existence with the...