Nigeria school blast kills dozens
The Nigerian police say at least 46 students have been killed by a suicide bomber at a school assembly in the north-eastern Nigerian town of Potiskum.
The explosion at the boys' school in the town is believed to have been caused by a suicide bomber dressed as a student.
The police say the militant group Boko Haram is believed to have carried out the attack.
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.
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