Protestors react as police fire tear gas near Hong Kong Polytechnic University after police gave protestors an ultimatum to leave the campus in Hong Kong, Sunday, Nov. 17, 2019. Police launched a late-night operation Sunday to try to flush about 200 protesters out of a university campus on a day of clashes in which an officer was hit in the leg with an arrow and massive barrages of tear gas and water cannons were fired. (AP Photo/Vincent Yu)
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