Officials from the school in the Chikun district of Kaduna told Agence France-Presse news agency that the attackers had arrested no fewer than 140 students and taken them to an undisclosed location.
However, Kaduna police said the final number of students abducted has yet to be determined.
Regional police spokesman Mohammed Jalige told CNN on Monday that the armed men, known locally as “bandits”, took an unspecified number of school children from the Bethel Baptist Secondary School in Kujuma around 1:45 am local time. Nobody was killed in the raid, said the spokesman.
Jalige said 26 students and one teacher have been rescued so far after “agents put the bandits in a hot chase”.
“The rescue operation continues,” said Jalige on Monday before. “We will contact the school administration to find out the exact number of those kidnapped.”
Reports of kidnapped nurse with baby
This raid was followed by a similar attack early on Sunday morning on a federal medical facility in the city of Zaria, less than two hours from Chikun.
Jalige said about eight people were abducted by an armed gang from the National Center for Tuberculosis and Leprosy District in Zaria. The police spokesman was unable to immediately confirm several reports that some of the abductees from the medical facility were nurses and a baby.
A hospital spokesman told Reuters that six people were kidnapped in the raid. There were two nurses, one with her 1-year-old child, a laboratory assistant, a security guard and another employee, the spokeswoman said.
Jalige told CNN that during the hospital attack, another group of armed men “tried to overrun a police base in the area” but were quickly rejected, adding that a rescue team was working to ensure the release of the abductees.
Kidnappings for ransom escalated in northern Nigeria, where hundreds of school children have been kidnapped since December. Kaduna, fast becoming the epicenter of school kidnappings in northern Nigeria, has witnessed a number of kidnappings since January.
Five students from Greenfield University in Kaduna were killed by their kidnappers shortly after their abduction in late April. Some schools in the northern region of Nigeria have been temporarily closed to avoid further attacks.