Boko Haram was suspected of killing nearly 50 pupils on Monday in a suicide bombing in northeast Nigeria, in one of the worst attacks against schools teaching a so-called Western curriculum.

The explosion at the all-boys school in Potiskum is the latest in a series of atrocities against students in the state of Yobe, and the second suicide attack in the town in eight days.

The massacre came just a day after the release of a new Boko Haram video in which the group's leader, Abubakar Shekau, again rejected Nigerian government claims of a cease-fire and peace talks.