People carry a survivor to an ambulance outside the headquarters of presidential office, in Sanaa, Yemen, on May 7, 2018. A powerful airstrike by Saudi-led coalition hit the headquarters of presidential office in the Yemeni capital Sanaa on Monday, targeting a secret meeting of Iranian-allied Shiite Houthi leaders and killing at least six, security sources at the scene told Xinhua. (Xinhua/Mohammed Mohammed)???