Militiamen loyal to President Abed Rabbo Mansour Hadi ride on an army vehicle on a street in Aden, Yemen, on March 20, 2015. Yemen's Shiite rebels, backed by supporters of former President Ali Abdullah Saleh, have seized the third-largest city after capturing the capital Sanaa in September, effectively splitting the country in half and hindering U.S. efforts to combat a powerful local al Qaeda affiliate. Hadi, a close U.S. ally, fled house arrest in Sanaa last month and has set up a base in the port city of Aden, the former capital of the once-independent south. (Associated Press) **FILE**