Hong Kong authorities have arrested 19 people - some with suspected ties to triads - after clashes with pro-democracy protesters in Mongkok on Friday.

Six officers and at least 12 people were injured during the fracas as police worked to contain the hours-long fight that began Friday afternoon and lasted through the night.

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The attackers, who had reportedly jeered the protesters and attempted to breach the barricades and destroy tents, were charged with unlawful assembly and public assault, said Senior Superintendent Patrick Kwok Pak Chung. Eight of the 19 are believed to have links with triads.

Protest group Hong Kong Federation of Students accused the government for allowing the attacks and called for protective measures. It also declared the postponement of the highly-anticipated talks between the government and pro-democracy advocates.

Occupy Central with Love leader Benny Tai said the group's stance on the talks was still undecided but pointed out the difficulty of pursuing negotiations when the government does nothing to stop the attacks on the peaceful protests.

News of the potential involvement of triads in the clashes fueled tensions on Saturday as pro-democracy activists repeatedly called to reinforce barricades after periodic rumors of possible attacks.

Even so, the demonstrations still persist.

"Of course I'm scared, but we have to stay and support everyone," 28-year-old banker Michael Yipu said.

It is unclear whether the attack was an organized effort or simply the result of frustration from civilians angry at the disruption caused by the protests but police have denied allegations of colluding with the assailants.

Some of the attackers reportedly sported blue ribbons, a contrast to the yellow ones worn by the demonstrators, the Associated Press relayed.

Residents opposed to the protests decry the chaos brought about by the demonstrations, arguing that it was illegal and that they still had to work to earn money and eat.

"Occupy is just a game," a construction worker identified only as Lee said.

Tagshong kong protests, Occupy Central with Love, Hong Kong Federation of Students, pro-democracy, universal suffrage