A female suicide bomber injured four people at a teachers’ college in northwest Nigeria on Wednesday.

A female suicide bomber injured four people at a teachers' college in northwest Nigeria on Wednesday.

Police spokesman Ibrahim Gambari said the woman had blown herself up at the Federal College of Education in Kontagora, Niger state before reaching her target, the school library where students were revising for exams.

The blast nonetheless injured four people -- three students and a bystander.
Earlier a student at the college spoke of 10 people dead.  

The attack 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.

The Boko Haram extremist group is opposed to so-called "Western education" and wants to create a hardline state in northern Nigeria.

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 extremist group.