Nigerian President Goodluck Jonathan declares a state of emergency during a live broadcast on state television on Tuesday. Utomi Ekpei/AFP/Getty hide caption

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Utomi Ekpei/AFP/Getty

NPR's Ofeibea Quist-Arcton on Nigeria's state of emergency

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One of the three churches bombed on Sunday in northern Nigeria by Boko Haram, triggering reprisal killings. Olu Ajayi/AP hide caption

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Olu Ajayi/AP

Onlookers view the wreckage of a car bomb that exploded outside a church near Madalla, Nigeria on Christmas Day, 2011 killing scores of people. Boko Haram claimed responsibility for the attack. Sunday Aghaeze/AP hide caption

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Sunday Aghaeze/AP