Tanks are seen in Yemen's southern Lahj governorate, some 50 kilometres north of the Red Sea port of Aden, on August 4, 2015. Pro-government forces pursued fleeing Shiite Huthi fighters in south Yemen, military sources said, as they looked to press recent gains against the rebels, including the retaking of a key airbase. AFP PHOTO / SALEH AL-OBEIDI (Photo credit should read SALEH AL-OBEIDI/AFP/Getty Images)
