Dozens of students killed and more than 100 trapped after school building collapses in Nigeria

Read MoreA two-story school has collapsed during morning classes in north-central Nigeria, trapping about 120 students and teachers, and setting off a frantic search for those in the rubbleA two-story school has collapsed during morning classes in north-central Nigeria, trapping about 120 students and teachers, and setting off a frantic search for those in the rubble