Chad will send a large number of troops to neighboring Cameroon to help it fight increasing incursions from Boko Haram Islamist militants attacking from Nigeria ... Biya has called for international military help to fight the Islamist militant group that has seized swathes of northern Nigeria and is threatening neighbors who share borders with the northeastern zones occupied by the group. Boko Haram, which aims to carve out an Islamist state in northern Nigeria, has stepped up attacks in the region as Nigeria, Africa's biggest economy, prepares for a crucial Feb. 14 presidential election. The group has also carried out...