Suicide bomber kills at least three people in Kano ; Kano suspected . Chibok is among six towns seized by fighters . Also Friday , a suicide bomber killed six people , including three police officers , and injured five others when he blew up his car at a gas station in northern Nigeria 's largest city of Kano , police said . Boko Haram fighters also overran two towns in Adamawa state , fleeing residents say . The militant Islamist `` are all over the town firing heavy guns , '' two resident says .
Suicide bomber kills at least three people in Kano ; Kano suspected . Chibok is among six towns seized by fighters . Boko Haram fighters also overran two towns in Adamawa state , fleeing residents say . The militant Islamist `` are all over the town firing heavy guns , '' two resident says .