Boko Haram's campaign of destruction spreads beyond Nigeria

Nigeria's Boko Haram, a militant Islamist group said to be responsible for kidnapping nearly 300 schoolgirls last year, have stepped up cross-border attacks in recent weeks in their campaign to carve out an Islamist emirate around the Lake Chad area bordering Nigeria, Chad, Cameroon and Niger.

Militants have staged attacks in Chad, Nigeria, Cameroon and Niger