The prayers of faithful Christians in Nigeria were interrupted by bombs detonated by Islamic militants during worship services on Christmas Day — attacks that are becoming perennial in a nation that rests on one of the theological fault lines between Christianity and Islam.

Last year, bombings in the Nigerian city of Jos killed dozens of people and wounded nearly a hundred more; this year the attacks by the Muslim group Boko Haram killed approximately 40 people. Bombs were detonated in the cities of Madalla, near the capital city of Abuja, Jos in central Nigeria, and in Damaturu and Gadaka in northern Yobe state, where fighting between the government and Boko Haram has been particularly fierce.

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