Out in numbers before the demonstration began, police intervened promptly when the rally turned into an impromptu march. Several units of police in riot gear were seen chasing protesters and several arrests were made.
Executive Director Kenneth Roth of Human Rights Watch says he has been able to enter Hong Kong freely in the past.
Scuffles erupted between police and protesters in Hong Kong on Sunday, with dozens of arrests made, after thousands marched near the border.
Police detained around 400 people for offences including unlawful assembly and possession of offensive weapons, in the protest which organisers said more than a million people attended.
Smaller crowds of protesters in the Mong Kok district set fire to barricades and riot police unleashed 2020's first volleys of tear gas in response.
Police will deploy more than 6,000 officers to deal with potential unrest over the New Year's period, according to the South China Morning Post newspaper, citing unnamed sources.
Police arrest about a dozen protesters and use pepper spray to break up a protest in Sheung Shui shopping mall aimed at disrupting retail businesses near border with mainland China.
The protests have been largely peaceful for much of December after pro-democracy candidates overwhelmingly won district council elections the month before.
Thousands of protesters, many wearing masks and reindeer horns, gathered on the streets after scuffles in shopping malls on Christmas Eve. The protests against China's control over the territory are now in their seventh month.
Riot police pepper-spray protesters to disperse crowds in the heart of the city's financial district as a largely peaceful rally in support of China's ethnic Muslim Uighurs turns chaotic.
Steve Li, a Senior Superintendent of the Police Organised Crime and Triad Bureau said that the man had been subdued by police after he’d fired a shot in the northern Tai Po district.
Carrie Lam is in Beijing for talks with Li and Chinese President Xi Jinping. It's her first visit to Beijing since pro-democracy candidates swept local Hong Kong elections last month.
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