In Nigerian vacuum, Boko Haram is expanding its base

More than a year after President Goodluck Jonathan vowed to eradicate the radical Islamists, the group is taking towns in the northeast. Can it create an Islamic caliphate? 

By , Correspondent

Jossy Ola/AP

Early this month a purported Boko Haram spokesman phoned reporters and spoke in gloating tones. Abu Zinnira, as he called himself, said his extremist group now controlled towns and villages in northern Nigeria.