Police run past debris set alight by protesters in the Causeway Bay area of Hong Kong on August 31, 2019, as people demonstrate, defying a ban on rallying – and mounting threats from China – to take to the streets for a 13th straight weekend. (Photo by Anthony Wallace/AFP Photo)





Protesters stand near burning items during a pro-democracy protest in causeway bay, Hong Kong, Saturday, August 31, 2019. Hundreds of people are rallying in an athletic park in central Hong Kong as a 13th-straight weekend of pro-democracy protests gets underway. (Photo by Vincent Yu/AP Photo)





A demonstrator holds a placard during a protest in Hong Kong, China on August 31, 2019. (Photo by Kai Pfaffenbach/Reuters)





Demonstrators put up a barricade during a protest in Hong Kong, China on August 31, 2019. (Photo by Danish Siddiqui/Reuters)





A demonstrator is detained by police officers during a protest in Hong Kong, China on August 31, 2019. Hong Kong police fired tear gas and water cannons and pro-democracy protesters threw petrol bombs in the latest in a series of chaotic clashes that have plunged the Chinese-ruled city into its worst political crisis in decades. (Photo by Kai Pfaffenbach/Reuters)





A protestor throws a molotov cocktail towards a barrier in Hong Kong, Saturday, August 31, 2019. Many of the protesters outside Hong Kong government headquarters have retreated as large contingents of police arrive on the streets in what looks like preparation for a clearing operation. (Photo by Kin Cheung/AP Photo)





Police attempt to arrest protesters at Prince Edward MTR Station, Hong Kong, Saturday, August 31, 2019. Hundreds of people are rallying in an athletic park in central Hong Kong as a 13th-straight weekend of pro-democracy protests gets underway. (Photo by Ring Yu/HK01 via AP Photo)





Policemen fire tear gas shells toward protestors at a shopping district of Hong Kong, Saturday, August 31, 2019. Many of the protesters outside Hong Kong government headquarters have retreated as large contingents of police arrive on the streets in what looks like preparation for a clearing operation. (Photo by Kin Cheung/AP Photo)





Police shoot pepper spray as they try to detain protesters inside a train at Prince Edward MTR Station, Hong Kong, Saturday, August 31, 2019. Hundreds of people are rallying in an athletic park in central Hong Kong as a 13th-straight weekend of pro-democracy protests gets underway. (Photo by Ring Yu/HK01 via AP Photo)





A policemen points a gun at protestors in Hong Kong, Saturday, August 31, 2019. Many of the protesters outside Hong Kong government headquarters have retreated as large contingents of police arrive on the streets in what looks like preparation for a clearing operation. (Photo by Kin Cheung/AP Photo)





Demonstrators set materials on fire near Wanchai police station on August 31, 2019 in Hong Kong, China. Large-scale protests of territory's bill to allow extraditions to China continue. (Photo by Fuat Kabakci/Anadolu Agency via Getty Images)





A protestor prepares to throw a molotov cocktail toward police officers in Hong Kong, Saturday, August 31, 2019. Many of the protesters outside Hong Kong government headquarters have retreated as large contingents of police arrive on the streets in what looks like preparation for a clearing operation. (Photo by Kin Cheung/AP Photo)





Policemen fire tear gas shells on protestors from the roof of a building in Hong Kong, Saturday, August 31, 2019. Many of the protesters outside Hong Kong government headquarters have retreated as large contingents of police arrive on the streets in what looks like preparation for a clearing operation. (Photo by Kin Cheung/AP Photo)





Police stand guard and protect themselves from paint thrown by protesters outside Mong Kok police station, Hong Kong, Saturday, August 31, 2019. Hundreds of people are rallying in an athletic park in central Hong Kong as a 13th-straight weekend of pro-democracy protests gets underway. (Photo by Vincent Yu/AP Photo)





A protestor prepares to hurl an object at police officers in Hong Kong, Saturday, August 31, 2019. While other protesters marched back and forth elsewhere in the city, a large crowd wearing helmets and gas masks gathered outside the city government building. Some approached barriers that had been set up to keep protesters away and appeared to throw objects at the police on the other side. Others shone laser lights at the officers. (Photo by Kin Cheung/AP Photo)





A demonstrator runs away from a burning barricade during a protest in Hong Kong, China, August 31, 2019. (Photo by Anushree Fadnavis/Reuters)





A Tibetan exile shouts slogan during a protest to support Hong Kong pro-democracy protestors, in New Delhi, August 30, 2019. (Photo by Adnan Abidi/Reuters)