Police in riot gear round up suspected protesters during a demonstration in Hong Kong, Jan. 5, 2020.

People take part in a pro-democracy march in Hong Kong on Jan. 1, 2020. Tens of thousands of protesters marched in Hong Kong during a massive pro-democracy rally on New Year's Day.

Police arrest a Hong Kong protester after a Chinese flag was removed from a flag pole at a rally in Hong Kong, Dec. 22, 2019.

During a rally in Hong Kong to show support for the Uighur minority in China, a police officer aims a pistol at a protester, Dec. 22, 2019.

A woman writes a Christmas card for people who are in detention during the recent protests, at a footbridge in Mong Kok, Hong Kong, Dec. 13, 2019.

A protester holds a flag that reads: "Liberate Hong Kong, Revolution of Our Times" at a rally in Hong Kong, Dec. 12, 2019.

Protesters hide behind umbrellas during a Human Rights Day march, organised by the Civil Human Right Front, in Hong Kong, Dec. 8, 2019.

A protester is detained by riot police for a stop and search during a demonstration on Dec. 8, 2019 in Hong Kong.

Hong Kong's pro-democracy protesters take part in a rally organized by the Civil Human Rights Front ahead of the upcoming Human Rights Day, in Hong Kong, Dec. 8, 2019.

A pro-Beijing supporter yells at a photographer during a rally in Hong Kong on Dec. 7, 2019.

Masked woman and children hold a balloon and a placard reads "Guard the Future" as they attend a "No Tear Gas" rally in Hong Kong, Dec. 1, 2019.

Riot police hold up a black flag warning ahead of firing tear gas as people take part in a march from the Tsim Sha Tsui district to Hung Hom in Hong Kong on Dec. 1, 2019.

Pro-democracy protesters take part in a March of Gratitude rally to say thank you to the United States for their support on Dec. 01, 2019, in Hong Kong.

Medics assist a girl who was shot below her left eye with a pepper bullet after police fired to disperse pro-democracy protesters outside the Prince Edward MTR station on Nov. 30, 2019, in Hong Kong.

Anti-government protesters hold hands to form a human chain at Kowloon Bay in Hong Kong, Nov. 30, 2019.

Demonstrators hold an SOS sign and U.S. flags during a Thanksgiving rally in Hong Kong, Nov. 28, 2019.

A safety team arrives to search for any remaining dangerous explosives and chemicals at the Hong Kong Polytechnic University in Hong Kong, Nov. 28, 2019.

Protesters surrender themselves to police outside the Hong Kong Polytechnic University campus in Hong Kong, Nov. 22, 2019.

Police detain protesters and students after they tried to flee outside the Hong Kong Polytechnic University campus in the Hung Hom district of Hong Kong on Nov. 19, 2019.

Protesters run away as riot police fire tear gas at Hong Kong Polytechnic University campus, in Hung Hom district in Hong Kong on Nov. 18, 2019.

Protesters are detained by police near the Hong Kong Polytechnic University in Hung Hom district of Hong Kong on Nov. 18, 2019.

Police in riot gear move through a cloud of smoke as they detain a protestor at the Hong Kong Polytechnic University in Hong Kong, Nov. 18, 2019.

Protesters take a rope down from a bridge to a highway, to escape from Hong Kong Polytechnic University campus and from police, in Hung Hom district in Hong Kong on Nov. 18, 2019.

Anti-government protesters trapped inside Hong Kong Polytechnic University use ropes to climb down onto a highway and escape before being forced to surrender during a police besiege of the campus in Hong Kong, China, Nov. 18, 2019.

Protesters run back to the campus after police advanced while they were trying to leave Hong Kong Polytechnic University in Hung Hom district of Hong Kong on Nov. 18, 2019.

A riot police officer stomps on an umbrella used by pro-democracy protesters during clashes outside the Hong Kong Polytechnic University (PolyU), in Hong Kong, China, Nov. 18, 2019.

Anti-government demonstrators throw Molotov cocktails towards police vehicles during clashes, outside Hong Kong Polytechnic University in Hong Kong, Nov. 17, 2019.

Demonstrators and police clash as on a bridge at The Hong Kong Polytechnic University, Nov. 17, 2019, in Hong Kong.

Demonstrators stand outside of the Chinese University of Hong Kong, in Hong Kong, Nov. 13, 2019.

Riot police officers detain a demonstrator during an anti-government protest in Hong Kong, Nov. 13, 2019.

Demostrators try using a catapult made with bamboo at the Chinese University of Hong Kong (CUHK), Nov. 13, 2019.

A man reacts as he tries to extinguish a burning Christmas tree at Festival Walk mall in Kowloon Tong, Hong Kong, China, Nov. 12, 2019.

Protesters face off against riot police during an anti-government demonstration in the Mong Kok district of Hong Kong on Monday night, Nov. 11, 2019.

Police stand guard during a rally against police brutality in Hong Kong, China, Oct. 27, 2019.

Riot police charge on a street during a demonstration in Yuen Long district, Oct. 5, 2019, in Hong Kong, China.

Masked demonstrators hold hands to form a human chain to protest against the ban on masks in Hong Kong, Oct. 5, 2019.

Police clash with demonstrators in Hong Kong, Oct. 1, 2019. Clashes reached their most intense point in four months of protests on the same day Beijing celebrated 70 years of Communist Party rule.

Demonstrators throw Molotov cocktails at the entrance of Cheung Sha Wan Government Office, Oct. 1, 2019, in Hong Kong.

Police use tear gas to dispel protestors in Hong Kong, Sept. 29, 2019.

A pro-democracy protester is tackled and arrested by police during clashes after a march on September 29, 2019, in Hong Kong, China.

Riot police pepper spray at member of media in Causeway Bay after a clash with protesters on September 29, 2019, in Hong Kong, China.

Protestors destroy a taxi in Hong Kong, China, Sept. 29, 2019.

Students hold a 'Lennon Wall flag', designed by Australia based Chinese political artist Badiucao, as they join hands to form a human chain in the Kwun Tong area of Kowloon in Hong Kong, Sept. 24, 2019.

A riot police officer reacts during clashes with pro-democracy demonstrators in Yeun Long district in Hong Kong, Sept. 21, 2019.

An injured man is being taken care of by First Aid rescuers during a protest in Hong Kong, Sept. 15, 2019.

A protestor hurls back an exploded tear gas shell at police officers in Hong Kong, Saturday, Aug. 31, 2019.

Police fire tear gas at protesters during an anti-government rally in Hong Kong, China, 31 August 2019.

Riot police arrest protesters after clashes in Sham Shui Po on August 29, 2019, in Hong Kong, China.

People light up their smartphones as they take part in a rally at the financial district in Hong Kong, Aug. 28, 2019.

Riot police fire tear gas to disperse anti-government protesters outside a shopping mall in Tsuen Wan, Hong Kong, China, on Aug 25, 2019.

A policeman points his gun toward demonstrators on a street during a protest in Hong Kong, Aug. 25, 2019.

An anti-riot police vehicle equipped with a water cannon clears the road from a barricade set up by demonstrators during an anti-government rally in Hong Kong, Aug. 25, 2019.

A fire breaks out as demonstrators and police officers in riot gear clash in the Kowloon Bay district of Hong Kong, Aug. 24, 2019.

People light up mobile phones at the hill top of Lion Rock in Hong Kong on August 23, 2019. Thousands of people held hands across Hong Kong late August 23 in a dazzling, neon-framed recreation of a pro-democracy "Baltic Way" protest against Soviet rule three decades ago.

Demonstrators fill a multilane main road during a march in the Causeway Bay shopping district of Hong Kong, Aug. 18, 2019. After days of violence and warnings from the Chinese government, organizers estimated at least 1.7 million people had turned out to march through the city center in the pouring rain.

Police fire tear gas to clear pro-Democracy protesters during a demonstration on Hungry Ghost Festival day in the Sham Shui Po district on August 14, 2019, in Hong Kong, China.

Policemen with batons and shields shout at protesters during a demonstration at the Airport in Hong Kong, Aug. 13, 2019.

A protester is detained by police during a demonstration, Aug. 3, 2019, in Hong Kong, China. Pro-democracy protesters have continued to rally on the streets of Hong Kong against a controversial extradition bill even after Hong Kong's Chief Executive Carrie Lam apologized for introducing the bill and declared it "dead."

A tourist gives her luggage to security guards as she tries to enter the departures gate during while demonstrations continued at Hong Kong's International Airport, Aug. 13, 2019.

A bleeding man is escorted by police after he was attacked by demonstrators in Hong Kong, July 31, 2019. Demonstrators clashed with police in Hong Kong after reports that some of their detained colleagues would be charged with the relatively serious charge of rioting.

Thousands of Hong Kong protesters participate in a march from a public park to call for an independent investigation into police tactics, July 21, 2019.

A person sprays paint over Hong Kong's coats of arms inside the chamber after protesters broke into the Legislative Council building during the anniversary of Hong Kong's handover to China, July 1, 2019, in Hong Kong.

Ten of thousands of protesters flood the streets during a rally in Hong Kong, July 1, 2019.

Protesters fill the streets of Hong Kong to rally against the extradition bill ahead of 2019 G20 Osaka summit, June 26, 2019 in Hong Kong.

Police man a road as protesters attend a rally against a controversial extradition law proposal outside the government headquarters in Hong Kong, June 12, 2019.