A bomber kills six people in Kano ; Boko Haram suspected . The group has said its aim is to impose a stricter enforcement of Sharia law across Nigeria , which is split between a majority Muslim north and a mostly Christian south . Chibok is among at least three towns attacked by fighters . Boko Haram fighters also overran several towns in Adamawa State , fleeing from there . The militant ' ` ` are all over the town firing heavy weapons , '' one resident says .
A bomber kills six people in Kano ; Boko Haram suspected . Chibok is among at least three towns attacked by fighters . Boko Haram fighters also overran several towns in Adamawa State , fleeing from there . The militant ' ` ` are all over the town firing heavy weapons , '' one resident says .