AP Photos: Hong Kong police battle protesters on campus

Hong Kong police using tear gas and batons fought running battles Monday with protesters who tried to break through a security cordon that trapped hundreds of them at the city's Polytechnic University. Protesters advanced on the police from outside the cordon, while others emerged from the campus, their trademark umbrellas at the fore. Police used tear gas and, in some places, swooped in to subdue protesters and make arrests.
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