Xiao He, vice-mayor of Nyingchi, briefs media on the barrier lake on the Yarlung Tsangpo River at a press conference in southwest China's Tibet Autonomous Region, Oct. 19, 2018. Water levels are dropping after an overflow at a barrier lake formed after a landslide in the Yarlung Tsangpo River in southwest China's Tibet Autonomous Region, local officials said Friday. TO GO WITH: Water level in Tibet barrier lake drops after overflow. (Xinhua/Chogo)