The police spokesman in the central Nigerian state of Niger said only the suicide bomber died today at the Federal College of Education,Kotangora, scene of another terrorist attack.
There were four other persons who were injured.
Ibrahim Gambari, the spokesman said among the injured were three students. The fourth person was a bystander.
“An unidentified suicide bomber blew herself up before she could reach her target, which was the school library where many students were reading for their exams,” Gambari said.
At least 10 people were initially feared dead in the blast, according to a student at the scene.
The blast came two days after nearly 60 people were killed in a suspected Boko Haram suicide bombing at a school in the town of Potiskum in northeast Yobe state.
Nigerians have come to expect near daily Boko Haram attacks in the far northeast but the latest attack will raise fresh concern if linked to the Islamist uprising.
Niger state has not been touched by the insurgency in more than two years and Kontagora is roughly 2,000 kilometres (1,200 miles) from Boko Haram’s northeastern stronghold.
On the Monday’s Yobe bombing, an official from the all-boys school in Potiskum, who requested anonymity, said the casualty toll had risen to 58 dead and 117 injured.
Police had previously put fatalities from the bombing at 47 and the wounded at 79.
Gambari said earlier while confirming the bombing that teams had been dispatched from the Niger state capital, Minna, some 150 kilometres (90 miles) away.
At the scene, student Mary Okafor said the blast happened as they were sitting end of semester exams and saw everyone rush out of class.
“We saw bodies on the ground between the library and the female hostel. Among the bodies were two dismembered women who we believe were the bombers,” she added.
At least 10 students were killed and several others injured, she said.
“They have all been moved to the general hospital. We have all been asked to vacate the school. The authorities in the town have asked all schools to close,” she added.