In this image from video footage run on Thursday, Oct. 18, 2018, by China's CCTV via AP Video, emergency response team prepare to deploy after a landslide formed a barrier lake on Yarlung Tsangpo in Tibet in western China. Thousands of people have been evacuated following a landslide in Tibet that blocked the flow of one of the region's key rivers, China's emergency services said Thursday. Yellow headline in Chinese reads: "Formed 300 meters by 200 meters barrier." (CCTV via AP Video)