Smoke rises after an airstrike by the Saudi-led coalition in Sanaa, Yemen, Sunday, Sept. 6, 2015. The Saudi-led and U.S.-backed coalition, made up mainly of Gulf nations, has been launching airstrikes against Shiite rebels known as Houthis and their allies since March, part of an increasingly assertive military policy by both the Saudis and the UAE in the region. The rebels and army units loyal to former President Ali Abdullah Saleh are fighting forces loyal to President Abed Rabbo Mansour Hadi, who is in self-imposed exile in Saudi Arabia, as well as southern separatists and local militias. (AP Photo/Hani Mohammed)