FILE – In this Jan. 27, 2020, file photo, paramilitary police wear face masks as they stand guard at Tiananmen Gate adjacent to Tiananmen Square in Beijing. U.S. financial news service Bloomberg said Friday, Dec. 11, 2020, that Chinese authorities have detained one of its Beijing-based news assistants on what they said was suspicion of endangering national security. (AP Photo/Mark Schiefelbein, File)