A suicide bomber disguised in school uniform detonated explosives at a high school assembly in the northeast Nigerian city of Potiskum on Monday, killing at least 48 students, according to survivors and a morgue attendant.
Soldiers rushed to the scene, grisly with body parts, in the capital of Yobe state, but they were chased away with stones and calls by people angry at the military's inability to halt a 5-year-old Islamic insurgency that has killed thousands and driven hundreds of thousands from their homes.
A suicide bomb attack in the same city killed 30 people one week ago, when suspected Boko Haram fighters attacked a religious procession of moderate Muslims.