epa04817317 Southern militiamen loyal to Yemen’s fugitive President Abdo Rabbo Mansour Hadi fire from a tank against alleged positions held by Houthi fighters in the southern port city of Aden, Yemen, 24 June 2015. According to reports, the UN envoy for Yemen Ismail Ould Cheikh Ahmed urged warring sides in Yemen to agree to a ceasefire three months after a Saudi-led coalition launched its military operations against the Houthis and allied military units since late March. The Houthi rebels have been fighting a range of local opponents in Yemen, including supporters of the internationally recognized government, which is in exile in Saudi Arabia. EPA/STRINGER