Police armed with pepper spray and batons have clashed with pro-democracy demonstrators in Hong Kong again as fears grew that officials would move in to clear the streets of protesters.
Large crowds of protesters scuffled with officers overnight in the blue-collar Mong Kok district in Kowloon.
Police said the crowds provoked officers with verbal abuse, while the students accused police of failing to protect them from attacks by mobs intent on driving them away.
The city's top leader, chief executive Leung Chun-ying, appeared on television to again urge everyone to go home, saying key roads paralysed by protesters need to return to normal by Monday.
Tensions remain high on the streets of Hong Kong this morning after overnight clashes between pro-democracy protesters and opponents injured 12 people including six police officers and 19 people were arrested.
Hong Kong police arrested 19 people overnight as clashes continued between pro-democracy protesters and opponents of their week-long occupation.
Police said 12 people including six officers were injured during street fights but they denied any connection to criminal gangs suspected of inciting attacks on largely peaceful demonstrators.
Senior Superintendent Patrick Kwok Pak-chung said most of those arrested were facing charges of unlawful assembly, fighting in public and assault.
The confrontations, mostly in Mong Kok district, led protest leaders to call off planned talks with the government on political reforms.
For the first time scuffles have broken out in the middle of the huge pro-democracy Protests in Hong Kong.
It is calm again now, but the trouble was prompted by the arrival of people claiming to be local who wanted their City Centre back.
The protesters think they were stooges of the Chinese authorities and called off talks.
From Hong Kong ITV News China correspondent Lucy Watson reports:
The leaders of a pro-democracy protest group have postponed talks with the government following violence between protesters and supporters of Chinese rule.
The Hong Kong Federation of Students accused authorities of allowing Pro-China groups to "attack peaceful protesters".
Pro-democracy activists in Hong Kong have threatened to call off talks with the government unless police stop supporters of Chinese rule from attacking them.
Anti-Occupy protesters continued to clash with activists in Mong Kok on Friday, with claims many began spitting and throwing water bottles in a bid to clear the protest movement.
Scuffles broke out earlier in one of Hong Kong's most famous and congested shopping districts, as hundreds of supporters of Chinese rule clashed with pro-democracy protesters.
As night fell and news of the confrontation spread, more protesters headed for the gritty, bustling district of Mong Kok, regarded as one of the most crowded places on the planet, to reinforce their lines, despite calls from leaders to relocate to Admiralty, the main protest site next to the Central Buisness District.
Police were hard-pressed to keep order as the two sides tussled in a tense stand-off between pro-democracy protesters, local residents and pro-Beijing supporters as they tried to evict the activists from the street they are occupying in a crowded district of Hong Kong.
The generally older people trying to force out the vastly outnumbered protesters were yelling, shoving and at times trying to drag the protesters away.
Police formed cordons and escorted some of the protesters away as hundreds chanted: "Go home."
The democracy activists linked arms and held hands as they tried to stand their ground against the huge crowd. At one point, police brought in a stretcher to take away a young man.
Pro-democracy protesters have clashed with local residents and pro-Beijing supporters as they tried to evict the activists from the street they are occupying in a crowded district of Hong Kong.
The two groups started pushing and shoving in a tense stand-off as police tried to keep them apart in Kowloon's crowded Mong Kok neighbourhood.
The democracy activists linked hands as they tried to stand their ground against the huge crowd. At one point, police brought in a stretcher to take away a young man.
An afternoon thunderstorm - and sheer exhaustion after the week-long protests - also appeared to keep many people off the streets.
Protesters have strung broken umbrellas together as a colourful art installation near the government offices in Hong Kong.
Earlier, the Hong Kong chief executive's call for dialogue was deemed "meaningless" by some protesters after he refused to step down.