Police fired tear gas from the other side of the barriers, then brought out a water cannon truck that fired regular water and then a blue liquid at protesters.
Hong Kong police fired a blue-dyed liquid from water cannons and tear gas on Saturday in a standoff with protesters outside government headquarters.
While other protesters marched back and forth elsewhere in the city, a large crowd wearing helmets and gas masks gathered outside the city government building.
Some approached barriers that had been set up to keep protesters away and appeared to throw objects at the police on the other side. Others shone laser lights at the officers.
Police fired tear gas from the other side of the barriers, then brought out a water cannon truck that fired regular water and then a blue liquid at the protesters, staining them and nearby journalists and leaving blue puddles in the street.
TRT World's Philip Owira reports.
Earlier, large crowds of protesters gathered in central Hong Kong as police readied for possible confrontations near the Chinese government's main office and elsewhere in the semiautonomous territory.
A march to mark the fifth anniversary of China's decision against fully democratic elections in Hong Kong was not permitted by police, but protesters took to the streets anyway in the 13th straight weekend of demonstrations.
The mostly young, black-shirted protesters took over roads and major intersections in shopping districts as they rallied and marched. Police erected additional barriers and brought out two water cannon trucks near the Chinese government office and deployed at various locations in riot gear.
Hong Kong police fight running battles with protesters in Wan Chai entertainment district. Bruce Harrison reports on tactics being used by demonstrators pic.twitter.com/PrNPMf93wG— TRT World Now (@TRTWorldNow) August 31, 2019
Democratic Party lawmaker Lam Cheuk-ting said Hong Kong citizens would keep fighting for their rights and freedoms despite the arrests of several prominent activists and lawmakers in the past two days, including activist Joshua Wong.
The protests were sparked by a now-shelved extradition bill. Protesters are demanding its full withdrawal, democratic elections and an investigation into alleged police brutality in what have been pitched battles with hard-line demonstrators.
"I do believe the government deliberately arrested several leaders of the democratic camp to try to threaten Hong Kong people not to come out to fight against the evil law," Lam said at what was advertised as a Christian march earlier in the day.
About 1,000 people marched to a Methodist church and police headquarters. They alternated between singing hymns and chanting the slogans of the pro-democracy movement. An online flyer for the demonstration called it a "prayer for sinners" and featured images of a Christian cross and embattled Hong Kong leader Carrie Lam, who had proposed the extradition bill.
Authorities rejected an application from the Civil Human Rights Front, the organizer of pro-democracy marches that have drawn upward of a million people this summer, for a march to the Chinese government office. Police said that while previous marches have started peacefully, they have increasingly degenerated into violence in the end.
The standing committee of China's legislature ruled on Aug. 31, 2014, that Hong Kong residents could elect their leader directly, but that the candidates would have to be approved by a nominating committee.
The decision failed to satisfy democracy advocates in the city and led to the 79-day long Occupy Central protests that fall, in which demonstrators camped out on major streets in the financial district and other parts of Hong Kong.
The participants in the religious march Saturday were peaceful and mostly older than the younger protesters who have led this summer's movement and, in some cases, blocked streets and battled police with bricks, sticks and gasoline bombs
Religious meetings do not require police approval, though authorities said late Friday that organizers of a procession with more than 30 people must notify police.
The government shut down streets and subway service near the Chinese government's office, about 5 kilometers (3 miles) west of the religious march.
"A public event is expected on Hong Kong Island this afternoon which may cause severe disruptions," police said. "Text messages have been sent to alert members of the public to mind their personal safety."