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Riot police launch tear gas into the crowd as thousands of protesters surround the government headquarters in Hong Kong, Sept. 28, 2014. Hong Kong police used tear gas on Sunday and warned of further measures as they tried to clear thousands of pro-democracy protesters gathered outside government headquarters in a challenge to Beijing over its decision to restrict democratic reforms for the city.

Wally Santana/AP Photo

A student protester is overcome by pepper spray from riot police as thousands of protesters surround the government headquarters in Hong Kong, Sept. 28, 2014.

Wally Santana/AP Photo

Thousands of people block a main road in Hong Kong, Sept. 28, 2014.

Vincent Yu/AP Photo

A protester raises a placard that reads "Occupy Central" between riot policemen and protesters outside the government headquarters in Hong Kong, Sept. 27, 2014.

Vincent Yu/AP Photo

A student protester is overcome by pepper spray from riot police as thousands of protesters surround the government headquarters in Hong Kong, Sept. 28, 2014.

Wally Santana/AP Photo

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Photos: Hong Kong Democracy Protests vs. Tear Gas