The attack took place in the northern Nigerian city of Kano . Dozens escaped , but more than 200 girls are still missing . It was not immediately clear who was behind it . Boko Haram has been blamed for a series of attacks on schools and churches since 2009.
The attack took place in the northern Nigerian city of Kano . It was not immediately clear who was behind it . Boko Haram has been blamed for a series of attacks on schools and churches since 2009.