Last week , Boko Haram demonstrated its resilience in the face of a crackdown by Nigerian security forces with a mass attack on an air force base in the northern city of Maiduguri . Some analysts fear fighting could fuel regional confrontation between Christians , Muslims . ` ` We have never seen anything as bad as this before , '' missionary says of violence . Comment: Anthropologist : Sectarian killing overlaps with other grievances in Central African Republic .
Some analysts fear fighting could fuel regional confrontation between Christians , Muslims . ` ` We have never seen anything as bad as this before , '' missionary says of violence . Comment: Anthropologist : Sectarian killing overlaps with other grievances in Central African Republic .