At least on person has been killed and an unknown number of students have been kidnapped from a university in Kaduna state.
Police confirmed this on Wednesday, in the latest in a series of abductions at educational institutes.
Armed groups have repeatedly struck northern Nigerian schools and universities since December, abducting more than 700 students for ransom.
The government and security forces have largely been unable to stop the attacks as they struggle to contain worsening violence and criminality across the West African country.
The armed kidnappers came on foot and struck Greenfield University in Kaduna at around 8.15 p.m. (1915 GMT) on Tuesday, state police spokesman Mohammed Jalige said by telephone.
“One of the staff of the university was shot dead, but the number of students abducted is not yet ascertained,” said Jalige, adding that police should know the number later on Wednesday.