Boko Haram fighters are ready to confront soldiers deployed to the area , a spokesman says . Human rights activist Mohammed Sani tells CNN that many Christians have nowhere else to go . The militant Islamist group Boko Haram has issued an ultimatum giving Christians living in northern Nigeria three days to leave the area amid a rising tide of violence there . An announced state of emergency will not help , a rights activist says . " Nigeria 's capacity to inflict mass casualties has grown quickly .
Boko Haram fighters are ready to confront soldiers deployed to the area , a spokesman says . Human rights activist Mohammed Sani tells CNN that many Christians have nowhere else to go . An announced state of emergency will not help , a rights activist says . " Nigeria 's capacity to inflict mass casualties has grown quickly .