HONG KONG (Reuters) - Thousands of civil servants joined in the anti-government protests in Hong Kong on Friday for the first time since they started two months ago, defying a warning from the authorities to remain politically neutral.

Protests against a proposed bill that would allow people to be extradited to stand trial in mainland China have grown increasingly violent, with police accused of excessive use of force and failing to protect protesters from suspected gang attacks.

Chanting encouragement, crowds turned out to support the civil servants at their rally on Friday evening which halted traffic on major roads in the heart of the city’s business district.

“I think the government should respond to the demands, instead of pushing the police to the frontline as a shield,” said Kathy Yip, a 26-year-old government worker.

The rally on Friday came after an open letter penned anonymously and published on Facebook set out a series of demands to the Hong Kong government by a group which said it represented civil servants.

“At present the people of Hong Kong are already on the verge of collapse,” the group wrote in the letter, saying it was “a pity that we have seen extreme oppression.”

The group also listed five demands: complete withdrawal of the extradition bill; a halt to descriptions of the protests as ‘rioting’; a waiver of charges against those arrested; an independent inquiry and resumption of political reform.

The protests against a now suspended extradition bill have widened to demand greater democracy and the resignation of Hong Kong’s leader Carrie Lam, and have become one of the gravest populist challenges to Communist Party rulers in Beijing.

China’s new ambassador to the United Nations, Zhang Jun, said on Friday that Beijing supported the action taken by Hong Kong’s government to “bring back the normal order, the rule of law, the normal life of people.”

“The demonstration has gone far beyond the nature of a peaceful demonstration, it’s really turning out to be chaotic and violent and we should no longer allow them to continue this reprehensible behavior,” Zhang said. “We do not think that it’s in the long term interest of anyone.”

On Thursday the government said Hong Kong’s 180,000 civil servants must remain politically neutral as the city braced for another wave of protests over the weekend and a mass strike on Monday across sectors such as transport, schools and corporates.

“At this difficult moment, government colleagues have to stay united and work together to uphold the core values of the civil service,” the government said in a statement.

Protest organizer’s said over 40,000 people participated in Friday’s rally, while the police put the number at 13,000.

Police said they had arrested eight people, including a leading pro-independence leader, after seizing weapons and suspected bomb-making material in a raid.

Under Chinese rule Hong Kong has been allowed to retain extensive freedoms, such as an independent judiciary, but many residents see the extradition bill as the latest step in a relentless march toward mainland control.Anson Chan, former chief secretary, said the rally was spontaneous and civil servants enjoyed the right to assembly and it could not be said to impair political neutrality.

Many civil servants, however, were apprehensive about identifying themselves, with many speaking anonymously or asking for only their first name to be used.

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MORE PROTESTS PLANNED

Hundreds of medical workers also demonstrated on Friday to protest against the government’s handling of situation. Large-scale protests are planned for the weekend in Mong Kok, Tseung Kwan O and Western districts.

In a warning to protesters, China’s People’s Liberation Army in Hong Kong on Wednesday released a video of “anti-riot” exercises and its top brass warned violence was “absolutely impermissible”.

The PLA has remained in barracks since protests started in April, leaving Hong Kong’s police force to deal with protests.

U.S. President Donald Trump has described protests in Hong Kong as “riots” that China will have to deal with itself.

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Police said seven men and a woman, aged between 24 and 31, were arrested on Friday after a raid on a building in the New Territories district of Sha Tin, where police seized weapons and suspected petrol bombs. Making or possessing explosives illegally can carry a sentence of up to 14 years in jail.

The police may arrest more people as the investigations unfold, police officer Li Kwai Wah said, adding, “Recently we are very worried about the escalating violence.”

Andy Chan, a founder of the pro-independence Hong Kong National Party that was banned last September, was among those arrested. His arrest prompted about 100 protesters to surround a police station to demand his release, television footage showed.

On Friday night, crowds of protesters surrounded a police station where Chan was being held, drawing out riot police to the street outside.

On Wednesday, 44 people were charged in a Hong Kong court with rioting over a recent protest near Beijing’s main representative office in the heart of the city.

The escalating protests, which have shut government offices, blocked roads and disrupted business, is taking a toll of the city’s economy and scaring off tourists.

Cheng aged 39, who was speaking behind a large black mask, said the recent triad attack on protesters and slow police response had angered him and his civil service peers.

Of the five protester demands, he said the need for an independent inquiry into the actions of the police was vital.

“I hope to stay in the civil service for a long time. But we have to act now.”