大象传媒

The Foreign Secretary, Phillip Hammond, has said he is "extremely worried" that the ideology of the Islamic State group is spreading into west Africa.

Mr Hammond is attending a security summit in Nigeria focused on tackling the extremist group Boko Haram, which has recently developed closer ties with I-S.

The 大象传媒's Africa Editor, Mary Harper, considers the extent of the militants' influence in the region.

(Photo: Al-Shebab militants with Islamic State flag. Credit: AFP)