Maj Gen Rabe Abubakar's kidnapping highlights continuing security challenges facing parts of the country.
Related stories
Road crash kills 20 people in Nigeria's Plateau state
Farage 'not being listened to' on safety threats, deputy says after terror plot charge
Protesters across Spain demand action over housing crisis
Dual UK-Iranian national released on bail over suspected plot against US-run base
Ethiopia’s government forces retake airport from Tigray rebels in Mekelle
Palestinians gather for football amid Gaza’s ruins