Security officers hold pro-democracy lawmaker Ted Hui who splashed liquid at the Legislative Council chamber during a meeting on the controversial national anthem bill in Hong Kong, China June 4, 2020. Hong Kong passed a bill on Thursday that would criminalise disrespect of China's national anthem, a move critics see as the latest sign of Beijing's tightening grip on the semi-autonomous city. REUTERS/Jessie Pang

Legislators attend a council meeting to discuss the controversial national anthem bill in Hong Kong, China June 4, 2020. Placards read, "Never forget June 4", "The people's determination is unstoppable" and "We will not be defeated". The move comes just days after Chinese authorities gave the green light to move ahead with a national security law, which the United States, Britain, Australia and Canada, as well as international human rights groups, say will erode freedoms in the global financial hub. REUTERS/Tyrone Siu

Hong Kong's Legislative Council attend a council meeting to discuss the controversial national anthem bill in Hong Kong, China June 4, 2020. The national anthem bill orders that primary and secondary school students in Hong Kong be taught to sing the "March of the Volunteers", along with its history and etiquette. REUTERS/Tyrone Siu

Firefighters check the chamber of the Legislative Council after pro-democracy lawmakers hurled objects during third reading on the controversial national anthem bill in Hong Kong, China June 4, 2020. It carries penalties of up to three years jail as well as fines of up to HK$50,000 ($6,450) for those who insult it. The anthem has been booed at football matches, where soccer fans have at times sang "Glory to Hong Kong", a song that has become a rallying cry for the democracy movement in the city. REUTERS/Tyrone Siu

The police take photos at the chamber of the Legislative Council after pro-democracy lawmakers hurled objects during third reading on the controversial national anthem bill in Hong Kong, China June 4, 2020. Hong Kong passed a bill on Thursday that would criminalise disrespect of China's national anthem, a move critics see as the latest sign of Beijing's tightening grip on the semi-autonomous city. REUTERS/Tyrone Siu

Firefighters wearing gas masks check the chamber of the Legislative Council after a pro-democracy lawmaker hurled an object during the second reading of a controversial national anthem law in Hong Kong, China. Hong Kong passed a bill on Thursday that would criminalise disrespect of China's national anthem, a move critics see as the latest sign of Beijing's tightening grip on the semi-autonomous city. REUTERS/Jessie Pang