AU security chief warns 'terrorism expanding' in Sahel The African Union's peace and security chief Smail Chergui calls for member states to tackle the root causes of extremism, as he decries the spread of "terrorism" in the Sahel. Chergui says the combination of extremist attacks, inter-ethnic conflict and clashes between pastoral and agricultural communities is leading to an "unprecedented high level of violence." IMAGES AND SOUNDBITES of the press conference at an African Union summit