TOPSHOT - Police fire tear gas on protesters taking part in a demonstration against what activists say is police violence in Hong Kong on July 28, 2019. - Tens of thousands of pro-democracy protesters defied authorities to hold an unsanctioned march through Hong Kong, a day after riot police fired rubber bullets and tear gas to disperse another illegal gathering, plunging the financial hub deeper into crisis. (Photo by Vivek Prakash / AFP)