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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 Â鶹Éç'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)