More than a thousand rival protesters, some wearing helmets, faced off in a densely populated, gritty district of Hong Kong yesterday, fuelling concerns that the Chinese-controlled city’s worst unrest in decades could take a more violent turn.

After a night of trouble which resulted in 19 arrests, supporters of the city’s pro-Beijing government rallied next to pro-democracy protesters in Mong Kok, a working class neighbourhood near the popular shopping district of Tsim Tsa Shui.

Many Hong Kong residents expressed anger and frustration at police handling of the unrest, with some accusing security forces of co-operating with criminal gangs, failing to make arrests and helping some attackers to exit the scene quickly.

“We condemn the violence used against Hong Kong civilians yesterday,” said student leader Joshua Wong.

“I find it ironic how people accuse us of being violent and radical and now after one week of peaceful protests the ones who use violence is them – the government that allows Triads to exercise brutality on peaceful protesters.”

After a week of largely peaceful demonstrations demanding Beijing grant Hong Kong the unfettered right to choose its own leader, the mood turned ugly on Friday night in an area notorious for being the home of Triads.

A rowdy crowd of around 2,000 filled the narrow streets of Mong Kok, one of the world’s most densely populated areas, in the small hours of yesterday and the atmosphere was highly charged as police in riot gear tried to keep them under control.

Among those detained by police were eight suspected gang members. Eighteen people were injured, including six police officers, according to local broadcaster RTHK.

Student activists, established protest groups and ordinary Hong Kongers have joined forces to present Beijing with one of its biggest political challenges since it violently crushed pro-democracy protests in and around Tiananmen Square in 1989.

Tens of thousands of protesters have staged sit-ins across Hong Kong over the past week, demanding the city’s pro-Beijing leader Leung Chun-ying step down and China reverse a decision made in August to handpick the candidates for Hong Kong’s 2017 leadership election.

A rowdy crowd filled the streets

After police fired tear gas against mostly student protesters last weekend, the demonstrations have been largely peaceful. But yesterday, some pro-democracy supporters – umbrellas in hand and wearing motor-bike helmets, gloves and black leather jackets – braced for trouble. Scores of yellow signs around the site occupied by pro-democracy supporters read: “Police and mob working together – an alternative violent crackdown.”

The pro-Beijing group, Caring Hong Kong Power, that organised the Mong Kok rally yesterday afternoon said it supported the use of guns by police, if necessary, and also the deployment of the People’s Liberation Army (PLA).

Hong Kong leader Leung has said the use of PLA soldiers would not be necessary.

One of the main student groups behind the Occupy Central protest movement said it would pull out of planned talks with the Hong Kong government, because it believed authorities had colluded in the attacks on demonstrators in Mong Kok.

Secretary for Security Lai Tung-kwok said allegations police were co-operating with the Triads were false.The gangs operate bars, nightclubs and massage parlours across Mong Kok, an area of high-rise apartments across the harbour from the protest areas.

At times over the past week, police have left the streets, saying they wanted to ease tensions, though the reason for their apparent absence from this scene yesterday morning was unclear.

Police have defended their handling of fighting in the area, saying they had exercised “dignity and restraint and tried our best to keep the situation under control”.

But Amnesty International issued a statement criticising them for “(failing) in their duty to protect hundreds of peaceful pro-democracy protesters from attacks by counter demonstrators”.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.