Hong Kong police appealed to protesters on Saturday to refrain from violence and leave the area after scuffles in the town of Sheung Shui, where thousands of demonstrators had converged earlier in the day to protest against mainland Chinese traders, TRT World reports.
The police made the announcement in a post on their website and in a message read out on television.
The protest in Sheung Shui, not far from the Chinese city of Shenzhen, started peacefully but devolved into skirmishes, with demonstrators throwing umbrellas and hard hats at police who retaliated by swinging batons and firing pepper spray.
Millions of people have taken part in street protests, with hundreds even storming the legislature on July 1, against the now-suspended extradition bill that would have allowed criminal suspects in Hong Kong to be sent to China to face trial.
Critics see the bill as a threat to Hong Kong's rule of law. Chief Executive Carrie Lam suspended the bill last month in the face of opposition and this week said it was "dead", but opponents say they will settle for nothing short of its formal withdrawal.
Most of the protests have taken place in and around Hong Kong's central business district, but recently demonstrators have turned their sights to parts of the territory that have seen less political activity.
The have also sought to broaden support for the movement by focusing on narrower, more domestic issues.