Nigerian police are trying to track the route kidnappers took with about 200 children that were seized in a raid on an Islamic school.
The attack took place in north-central Niger state, the authorities have ruled out paying a ransom.
Officials say a warplane was also flying over the area to try to spot them while worried parents waited for news.
Gunmen on motorbikes attacked the town on Sunday afternoon.
One person was shot dead during the attack and another seriously injured.
A local governor said they were trying to negotiate to see if the children could be returned.
More than 700 students have been kidnapped for ransom since December.
Taken by armed groups after raids on schools and universities in Nigeria's violent north.
While the government denies paying ransoms it is widely believed they have in the past.