Hong Kong (CNN) Dozens of people were injured Sunday in another night of violence in Hong Kong, as the city marked its fifteenth consecutive weekend of anti-government protests.

Thousands of people took part in a peaceful -- albeit unauthorized -- march from Causeway Bay to government offices in Admiralty, calling for the government to respond to the protest movement's five demands . That quickly turned violent after radical protesters gathered outside the legislature and began throwing bricks and petrol bombs at police lines.

Police responded with tear gas and water cannon, using jets of blue dye for the second time. The dye -- which is also laced with tear gas -- is designed to indelibly mark protesters and make them easy to arrest later.

The heavy response drove protesters back from the legislature and began a night of cat-and-mouse pursuit throughout the city, which saw protesters set fires and vandalize subway stations as police made sporadic arrests.

At least 28 people were injured Sunday, according to the hospital authority. Of those, 13 men and four women have been discharged as of Monday morning, while 11 remain in hospital. Two men are in a "serious condition," the authority said.

Pro-democracy protesters react as police fire water cannons at them outside the Central Government Complex on September 15, 2019 in Hong Kong.

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