About 300 people mounted a protest to oppose Sai Kung Outdoor Recreation Centre serving as a quarantine facility.
The protesters had gathered outside Sai Kung Tin Hau Temple around 1pm yesterday and marched to the town center with banners and chanting slogans such as "Don't make Sai Kung an infected area" and "We don't want a community outbreak."
Police raised the blue warning flag at about 3pm to declare the event an illegal assembly when protesters marched on Chui Tong Road.
Some protesters then ran into Lakeside Garden with officers in pursuit.
A middle-aged man was bleeding from a head wound after he fell unconscious, and protesters claimed he had been hit by police. And after he was taken away a large bloodstain marked the spot where he fell.
People, including reporters, were also stopped and searched on Chui Tong Road.
Sai Kung councillor Leung Hin-yan said later that the district officer told council vice-chairman Francis Chau Yin-ming that the quarantine facility at the center had in fact stopped operating and people there had been transferred to Tso Kung Tam Outdoor Recreation Centre in Tsuen Wan.
Chui Tak-yim, the undersecretary for food and health, was meanwhile in a closed-door meeting with Sha Tin district councilors over a plan to use the Chun Yeung Estate, a new public housing facility in Fo Tan, for quarantine purposes.
The meeting included district councillors criticizing a lack of consultation, and Chui admitted the decision was "hasty."
Councillor Mak Tsz-kin said: "We can't get a timetable for when Chun Yeung will be used for quarantine, and we don't know which blocks and units will be used."
Also, Mak said, there were no details of protective measures for nearby residents.
Chui was surrounded by district councillors after the four-hour meeting and had to be escorted away by anti-riot police.
There was more virus-based trouble at Tai Po, where 200 people marched in the afternoon in opposition to the Jockey Club Clinic there being a coronavirus clinic.
Some protesters also barricaded and blocked the junction of On Cheung Road and On Chee Road at around 4pm.