At least two officers were seen with bloody head wounds.
Riot police swept into the area and fired tear gas to disperse the crowds.
Brief cat and mouse clashes ensued with police making multiple arrests, including one protester who had blood streaming from the back of his head.
Hong Kong's protests have raged for seven months after being sparked by a now-abandoned proposal to allow extraditions to the authoritarian mainland, where the opaque legal system answers to the Communist Party.
It soon morphed into a wider movement calling for greater freedoms in what is the most concerted challenge to Beijing's rule since the former colony's 1997 handover.
The frequency and ferocity of the protests have died down over the last month, but signs of the political unrest are everywhere, from graffiti daubed on walls to huge fences surrounding government buildings.
Among key protester demands are an independent inquiry into the police, an amnesty for the thousands arrested and fully free elections.
Beijing and local leader Carrie Lam have refused further concessions.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)
Business Standard has always strived hard to provide up-to-date information and commentary on developments that are of interest to you and have wider political and economic implications for the country and the world. Your encouragement and constant feedback on how to improve our offering have only made our resolve and commitment to these ideals stronger. Even during these difficult times arising out of Covid-19, we continue to remain committed to keeping you informed and updated with credible news, authoritative views and incisive commentary on topical issues of relevance.
We, however, have a request.
As we battle the economic impact of the pandemic, we need your support even more, so that we can continue to offer you more quality content. Our subscription model has seen an encouraging response from many of you, who have subscribed to our online content. More subscription to our online content can only help us achieve the goals of offering you even better and more relevant content. We believe in free, fair and credible journalism. Your support through more subscriptions can help us practise the journalism to which we are committed.
Support quality journalism and subscribe to Business Standard.