Frustrations boiled over in two of the city's busiest shopping districts, where anti-protester groups started to dismantle barricades that demonstrators have been manning in their battle for fully free elections in the Chinese-ruled territory.
It was not immediately clear whether the anti-protester groups were disgruntled local business people tired of the disruption or -- as some protesters alleged -- hired hands brought in to stir up trouble.
The tense scenes came after protesters earlier scuffled with police near government headquarters at the epicentre of the protest and as China said the demonstrators were "doomed to fail".
Hong Kong's last British governor also weighed in, saying Beijing was "foolish" for not investing more trust in the city's seven million people.
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Following a fifth night of rallies, crowds thinned out today, leaving around 100 outside the government complex.
Demonstrators had set a midnight Thursday ultimatum for Chief Executive Leung Chun-ying to resign and for Beijing to abandon proposals under which it will vet candidates who want to stand for the chief executive's job in 2017 elections.
There was no sign of the talks starting by this afternoon, however. And mistrust was rife that Leung was merely trying to buy time in the hope that the Hong Kong public will tire of the disruption caused by the mass sit-ins, with businesses losing money, schools shut and bus routes severed.
"I think he is avoiding people who are voicing their views," Abigail Hon, 19, told AFP.
But the Occupy Central protest group said it welcomed the talks, and hoped they would "provide a turning point in the current political stalemate".