At least 46 students have been killed by a suicide bomber at a school assembly in the north-eastern Nigerian town of Potiskum, police have said.
The explosion at a boys’ school in the town is believed to have been caused by a suicide bomber dressed as a student.
The militant group Boko Haram is believed to have carried out the attack, police said.
The group has targeted schools during a deadly five-year insurgency aimed at establishing an Islamic state.
It is waging a sustained campaign to prevent children from going to school. It believes girls should not attend school and boys should only receive an Islamic education.
BBC