In the latest in a series of group kidnappings at schools in northwest Nigeria, which have been attributed by the authorities to armed bandits seeking ransom payments, gunmen killed a police officer and abducted five teachers and an unknown number of students on Thursday from a school in the north western Nigerian state of Kebbi. More than 800 Nigerian students have been kidnapped from their schools since December, mostly in the north western region. They are separate from Islamist insurgencies centred on the northeast, where the Boko Haram militant group made global headlines in 2014 when it abducted more than 270 schoolgirls from the town of Chibok.