African leaders call for more regional cooperation in fighting terrorism at a summit to look for African-led solutions to the continent's security challenges, including creating a possible regional military force. "Such a force can stand as a strong deterrent to large-scale and protracted terrorist operations," says Nigerian President Bola Ahmed Tinubu at the counter-terrorism summit in his country's capital Abuja. "The epicentre of terrorism has shifted from Middle East and North Africa into sub-Saharan Africa concentrated largely in the Sahel," UN Deputy Secretary-General Amina Mohammed tells the summit. IMAGES AND SOUNDBITES