UN envoy arrives in Yemen's Sanaa to meet with Houthi rebels

Security forces wait to escort the convoy of the UN Special Envoy Martin Griffiths at the Sanaa International Airport following his arrival in Sanaa, Yemen, Aug. 21, 2019. The United Nations Special Envoy to Yemen Martin Griffiths arrived in Sanaa on Wednesday to meet Houthi rebels over stalled peace talks. (Photo by Mohammed Mohammed/Xinhua)