Learn more about the Islamist group Boko Haram.
Boko Haram has terrorized northern Nigeria regularly since 2009, attacking police, schools, churches and civilians, and bombing government buildings. At least 5,000 people have died at Boko Haram's hands, according to a U.S. Congressional Research Service report, making it one of the world's deadliest terrorist organizations.
Mike Theiler-Pool/Getty Images
Tristan Fewings/Getty Images
Mark Wilson/Getty Images
Public Domain/Wikimedia Commons
Italian Navy via CNN
Alex Wong/Getty Images
Sign up for Breaking News, Daily Headlines, Severe Weather Alerts & more!