Armed men have killed a teacher and abducted at least 25 students in an attack on a girls' secondary school in north-western Nigeria, police say. The gang invaded the Government Girls Comprehensive Secondary School in Maga, Kebbi State, at around 04:00 local time (0300 GMT) on Monday, they said. The attackers "engaged police personnel on duty in a gun duel" before scaling the perimeter fence and seizing the students from their hostel, a statement said. One member of staff was killed while