Afolabi Sotunde / Reuters

Women weep over their loved ones who died in the Christmas day bomb explosion at St. Theresa's Catholic church in Madalla, just outside the capital Abuja, Dec. 31. Nigerian President Goodluck Jonathan visited the church on Saturday and vowed to "crush the terrorists" who set off a series of bombs across Nigeria on Christmas Day, killing at least 37 people.

Nigeria calls for state of emergency over sect attacks

AP reports:

The U.S. Embassy had warned U.S. citizens late Friday to exercise caution in Nigeria.

"Violent extremist attacks have continued in various locations, including the states of Bauchi, Borno, Gombe, Kaduna, Kano, Niger, Plateau, and Yobe, resulting in numerous casualties," the warning read.

Boko Haram's widening terror attacks, though, are only further intensifying religious divisions in Nigeria. In this nation of more than 160 million people, thousands have died in recent years in communal fighting pitting machete-wielding neighbors against each other.

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