Nigeria, Nov 11 (ANI): A suicide bomber dressed as a student killed at least 48 people, most of them students, and injured 79 others at a school assembly in the northeastern Nigerian town of Potiskum. No one immediately claimed responsibility for the attack in Yobe State, a territory close to the stronghold of Sunni Muslim Boko Haram militants, who have staged a five-year insurgency. Angry locals had blocked access to the school and an adjoining hospital, preventing security forces from getting close to the site of the explosion. Boko Haram has intensified its attacks since the Nigerian government announced a ceasefire agreement last month as well as the imminent release of more than 200 school girls kidnapped by the group. Boko Haram's leader denied a ceasefire deal had been reached and the school girls have not been set free.