Bomb blast at school kills 20 people just before classes

DAMATURU Nigeria - At least 20 people, most of them students, were killed in a bomb blast at a secondary school in Nigeria's northeastern town of Potiskum on Monday as they gathered for assembly before classes, a teacher said.

No one immediately claimed responsibility for the attack in Yobe State, a territory that has been hit by an insurgency by Islamist Boko Haram rebels. At least 29 people were killed in another bombing in the town on 3 November.

"As it stands now, we have taken about 20 dead bodies to the hospital. There are some that are critically injured and I am sure the death toll will rise," the teacher at the school told Reuters, asking to remain anonymous.