"Suspected members of the group have bombed or opened fire on worshipers in at least 18 churches across eight northern and central states since 2010. In Maiduguri, capital of Borno state, the group also forced Christian men to convert to Islam on penalty of death," it said.
MORE: http://www.cnn.com/2012/12/30/world/africa/nigeria-violence/index.html?hpt=iaf_c2
See also...
12 killed in attacks on two churches in Nigeria
http://www.cnn.com/2012/12/25/world/africa/nigeria-christmas-attack/index.html?hpt=iaf_c2
