KANO, Nigeria — In an imam’s quiet office, two young men in long hooded robes, their faces hidden by checked scarves, calmly described their deadly war against the Nigerian state.

The office door was open. Children from the Koranic school adjoining the mosque streamed past, laughing and jostling. Worshipers from the evening prayer service, which the young men had just left, poured into the parking lot. If the police had been alerted in any way, the two young men would have been instantly arrested, or worse. But neither appeared nervous about possible betrayal.

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