Analysis: Boko Haram tightens the noose on Maiduguri

Maiduguri is the jewel of Nigeria's north-east: it is the biggest city, the most important trading hub and a historical icon. It was also the birth place of Boko Haram, and the militant group is determined to make it the capital of its Islamic Caliphate. The city is under siege, and it seems to be only a matter of time before Boko Haram make good on this threat. By SIMON ALLISON.