Gunmen stormed a student hostel in northeastern Nigeria Tuesday, killing at least 20, police told BBC News. The brazen attack came in Mubi, days after an operation against the Islamist militants, the Boko Haram. A lecturer told the BBC that 40 students were shot dead, but that number hasn’t been confirmed. Several students have fled campus, while other are reportedly hiding indoors. The militants are fighting for Islamic law in Nigeria.