A YouTube video of Xinjiang detention facilities has rekindled concern over China's crackdown on ethnic minorities. Researchers say the videos offer new evidence, but many fear for the vlogger's safety.A 20-minute video featuring more than a dozen detention facilities in China's Xinjiang Uyghur Autonomous Region has offered fresh evidence and renewed the discussion around China's large-scale crackdown on ethnic minorities in the region. The video was filmed by a Chinese man named Guanguan, who went to Xinjiang after reading a series of articles from US news outlet BuzzFeed News, indicating the locations of several detention centers in the region. His...