Members of Islamic Movement of Nigeria, a Shia group, demand the release of the group’s leader, Sheik Ibrahim Zakzaky, who was arrested on December 14, 2015.  © AP Photo/Muhammed Giginyu

Members of Islamic Movement of Nigeria, a Shia group, demand the release of the group’s leader, Sheik Ibrahim Zakzaky, who was arrested on December 14, 2015. © AP Photo/Muhammed Giginyu