Secondary school students hold a Mickey Mouse stuffed doll with an eye patch as they form a human chain during a protest against what they say is police brutality against protesters, after clashes at Wan Chai district in Hong Kong, China September 9, 2019. Hundreds of secondary school students, many wearing masks with their uniforms, formed human chains in districts across Hong Kong. REUTERS/Amr Abdallah Dalsh

Secondary school students hold hands as they form a human chain as they demonstrate against what they say is police brutality against protesters, after clashes at Wan Chai district, in Hong Kong, China September 9, 2019. The protesters' other demands include the retraction of the word "riot" to describe demonstrations, the release of all those arrested and the right for Hong Kong people to choose their own leaders. REUTERS/Amr Abdallah Dalsh

Secondary school students hold hands as they form a human chain demonstrating against what they say is police brutality against protesters, after clashes at Wan Chai district in Hong Kong, China September 9, 2019. Three months of protests over a now withdrawn extradition bill have evolved into a broader backlash against the government. REUTERS/Amr Abdallah Dalsh

Secondary school students hold hands as they form a human chain demonstrating against what they say is police brutality against protesters, after clashes at Wan Chai district, in Hong Kong, China September 9, 2019. REUTERS/Amr Abdallah Dalsh

Secondary school students shout slogans as they form a human chain demonstrating against what they say is police brutality against protesters, after clashes at Wan Chai district in Hong Kong, China September 9, 2019. REUTERS/Amr Abdallah Dalsh

Secondary school students wearing masks join a human chain protesting against what they say is police brutality against protesters, after clashes at Wan Chai district in Hong Kong, China September 9, 2019. REUTERS/Amr Abdallah Dalsh