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Demonstrators hold umbrellas and shields while standing off against riot police during a protest in Tsim Sha Tsui district of Hong Kong, China, on Monday, Nov. 18, 2019. Protesters clashed with police in chaotic scenes as dozens fled Hong Kong Polytechnic University in Kowloon, leading to multiple arrests and injuries, as a standoff continued in the heart of the city. Photographer: Kyle Lam/Bloomberg via Getty Images

Demonstrators hold umbrellas and shields while standing off against riot police during a protest in Tsim Sha Tsui district of Hong Kong, China, on Monday, Nov. 18, 2019. Protesters clashed with police in chaotic scenes as dozens fled Hong Kong Polytechnic University in Kowloon, leading to multiple arrests and injuries, as a standoff continued in the heart of the city. Photographer: Kyle Lam/Bloomberg via Getty Images