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 .
Suicide bomber kills six people in Kano ; Boko Haram suspected . Chibok is among at least three towns seized by fighters . Boko Haram fighters also overran two towns in Adamawa state , fleeing residents say . The militant Islamists `` are all over the town firing heavy guns , '' one resident says .