The Asian financial hub has been rocked for weeks by demonstrations -- some of which have drawn crowds of tens of thousands -- calling for fully free elections and the resignation of the city's leader Leung Chun-ying.
Protesters have held sit-ins at three major intersections causing significant disruption to a city usually known for its stability, and presenting Beijing with one of the most significant challenges to its authority since the 1989 Tiananmen protests.
China has insisted that whoever stands to replace Leung in 2017 elections must be vetted by a committee that is expected to be loyal to Beijing, a proposal protesters have dismissed as "fake democracy".
Earlier in the day officers had significantly reduced the size of the northern Mongkok camp -- the second largest after the main protest site opposite the government's headquarters in central Hong Kong -- in a swift dawn raid that saw no resistance from demonstrators.
Mongkok had previously seen clashes between protesters and masked government loyalists earlier in the month.
Throughout Friday demonstrators managed to hold on to one side of a multi-lane road where the camp had been located. Police then struggled to maintain order as crowds of pro-democracy supporters began to swell during the evening.
"We want to take back this spot because it's what we had," said Gary Yip, a 17-year-old high school student.
Violence broke out around 8 pm (1200 GMT) after several protesters tried to push through a police cordon.
Tents torn down
Protesters unfurled umbrellas and pushed against police lines, prompting officers in riot gear to respond with baton strikes and pepper spray in an attempt to hold back the surging crowds.
"The police have lost control of the situation. They've lost their minds," said protester Peter Yuen from behind the goggles he had donned to protect himself from pepper spray. "We've come here peacefully, to peacefully protest for our future."
Paula Bronstein, a photographer with the Getty Images agency, was arrested by police during the clashes for "suspicion of criminal damage" and later released on bail.
On Thursday the government had made a dramatic U-turn and announced a resumption of talks with the Hong Kong Federation of Students (HKFS), one of the groups leading the ongoing protests, after abruptly pulling out of discussions a week earlier.
But questions were soon raised over whether the talks could achieve a substantive breakthrough, with the government unwilling to cede to protesters' core demands and Leung adamant that police would continue to clear demonstrator-held barricades.
In a statement released shortly before renewed violence broke out in Mongkok, the HKFS imposed a deadline of next Wednesday for dialogue to begin with the government.
Leung had said Thursday he would like to start talks within the following week.
But the student federation warned that the clearance of the camp earlier in the day had already "damaged the foundation of talks".
Confrontations have spiked in recent days as police began chipping away at protester defences.
Tensions soared further after video footage emerged showing plainclothes police officers beating a handcuffed demonstrator on Wednesday during some of the most violent clashes since the protests began.
The victim, a social worker and local party activist, was arrested after being seen throwing water over officers.
Seven officers involved in the beating video have been suspended pending an investigation.
The incident has become another public relations disaster for the police, who were severely criticised for firing tear gas on umbrella-wielding protesters on September 28 in a move that attracted worldwide attention. - AFP
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