(180507) -- SANAA, May 7, 2018 (Xinhua) -- Two children stand beside vehicles 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) (zjl)

Photo taken on May 7, 2018 shows a damaged building of the headquarters of presidential office, in Sanaa, Yemen. 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)