Black smoke billows in the sky above areas where clashes are taking place between pro-government forces, who are backed by the locals, and the Shura Council of Libyan Revolutionaries, an alliance of former anti-Gaddafi rebels, who have joined forces with the Islamist group Ansar al-Sharia, in Benghazi April 18, 2015. REUTERS/Esam Omran Al-Fetori