Candidates looking to loosen China's grip on the semi-autonomous territory grabbed 388 out of 452 seats in 18 district councils, leaving only 59 for the establishment and five for independent candidates.
The first elections in Hong Kong following the months-long pro-democracy protests drew an unprecedented number of voters, with analysts expecting the pro-democracy camp to make gains although still falling short of a majority.
A video circulating on social media showed a man giving flowers to Junius Ho and asking permission for a photo with him. The man then drew a knife from his bag and stabbed Ho in the chest but was quickly overpowered by the victim and several others.
The warning comes as the international financial hub remained partly paralysed from three days of protests in which the city's rail network and business outlets seen as pro-China were vandalised.
Carrie Lam said a ban on face masks would take effect on Saturday under the emergency laws that allow authorities to "make any regulations whatsoever" in whatever they deem to be in the public interest.
Carrie Lam faces more than two hours of grilling at a public "dialogue session," the first time her pro-Beijing administration sits down with its critics in 16 consecutive weeks of unrest.
The Hong Kong protests started as a peaceful rebuke of the government in April but have evolved into a direct challenge to Chinese rule over this former British colony.
Pro-government rally, called "Safeguard Hong Kong," comes ahead of another protest planned against the government's handling of the now-suspended extradition bill that would have allowed people in Hong Kong to be sent to mainland China for trial.
Lam told media Saturday she took the move in response to widespread public unhappiness over the measure, which would enable authorities to send some suspects to stand trial in mainland courts.
Opponents of the extradition law called for fresh protests for Wednesday. Huge crowds on Sunday marched through the financial hub's main island against the proposed extradition law before a stand-off with the police.
Andy Chan, heading the fringe Hong Kong National Party, was invited to give a talk but his invitation sparked stern criticism both from Beijing and authorities in the city. China demanded the event be scrapped, but the club decided to press ahead.
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