TOPSHOT - A protester reacts after police fire tear gas to disperse bystanders in a protest in Jordan district in Hong Kong, on early December 25, 2019. - Hong Kong marked Christmas Eve with tear gas, petrol bombs and mall clashes on Tuesday night as battles between democracy activists and riot police swept through a major shopping district. The evening's unrest was the most sustained in what has otherwise been a few weeks of comparative calm for a city upended by more than six months of violent protests. (Photo by Philip FONG / AFP)