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Just how resilient are the foundations of the Nigerian state? We may be about to find out. Africa's most populous country has been rocked by a wave of bombings and shootings orchestrated by Boko Haram, a militant Islamist group intent on targeting the Nigerian security forces and the country's Christians.

Stephen Sackur speaks to respected human rights campaigner Shehu Sani who, in the past, has tried to reach out to Boko Haram. How can Nigeria avoid a spiral of sectarian conflict?