Tens of thousands of people have protested in Hong Kong for the tenth straight weekend, streaming into a central park in the rain.

While recent weeks have been marked by violent clashes between police and demonstrators, organisers called for Sunday's protest to be peaceful.

“We hope that there will not be any chaotic situations today,” said Bonnie Leung, a leader of the Civil Human Rights Front (CHRF). “We hope we can show the world that Hong Kong people can be totally peaceful.”

Many demonstrations have been arranged via word of mouth or social media, but the CHRF called Sunday's assembly after organising three massive marches in Hong Kong over summer

The group's last demonstration was on 1 July, the anniversary of Hong Kong’s reunification with China. On that occasion, radical protesters stormed the city’s legislature and tore down Chinese flags after a peaceful demonstration attended by tens of thousands of people.

Unlike much of the recent unrest, authorities gave official permission for Sunday’s demonstration in Victoria Park.

In Beijing, You Wenze, a spokesman for the Chinese government, condemned statements from US politicians supportive of Hong Kong’s pro-democracy movement.

Mr You called politicians’ comments “a gross violation of the spirit of the rule of law, a blatant double standard and a gross interference in China’s internal affairs.”

He claimed Hong Kong’s 7.5 million people and Chinese population as a whole rejected the actions of a “very small group of violent protesters” as well as “any interference of foreign forces”, remarks that have become common in China’s characterisation of the protest.

Continuing protests rock Hong Kong: In pictures Show all 35 1 /35 Continuing protests rock Hong Kong: In pictures Continuing protests rock Hong Kong: In pictures Police officers point their guns towards pro-democracy protesters after a clash at a march in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures Pro-democracy protesters throw molotov cocktails during clashes with riot police in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures Demonstrators rally behind barricades ass they are shrouded in tear gas deployed by police in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures Police clash withpro-democracy protesters at a march in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures A police officer prepares to strike a protester as clashes erupt during a pro-democracy march in Hong Kong on August 24 AFP/Getty Continuing protests rock Hong Kong: In pictures A water cannon is fired by riot police to clear the street of demonstrators during a protest in Hong Kong on August 25 EPA Continuing protests rock Hong Kong: In pictures Pro-democracy protesters use a slingshot during clashes with riot police in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures Riot police fire tear gas to disperse pro-democracy protesters in Hong Kong on August 24 Reuters Continuing protests rock Hong Kong: In pictures A demonstrator throws a molotov cocktail as they clash with riot police during a protest in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures A demonstrator swings a tennis racket in an attempt to knock back a tear gas cannister thrown by riot police during a protest in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures A protester displays a Hong Kong Independence flag during a pro-democracy march in Hong Kong on August 24 EPA Continuing protests rock Hong Kong: In pictures Riot police tend to a detained demonstrator who has been injured during a protest in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures A demonstrator uses bamboo poles to build a barricade during a protest in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures Riot police clash with demonstrators during a protest in Hong Kong on August 24 Reuters Continuing protests rock Hong Kong: In pictures Protesters are hit by tear gas fired by the police in Hong Kong on August 24 AFP/Getty Continuing protests rock Hong Kong: In pictures Demonstrators shrouded in tear gas shield themselves behind barricades during a clash with riot police in Hong Kong on August 25 Getty Continuing protests rock Hong Kong: In pictures Riot police arrest a protester during a pro-democracy march in Hong Kong on August 24 EPA Continuing protests rock Hong Kong: In pictures Police clash with pro-democracy protesters at the Hong Kong international airport on August 13 AFP/Getty Continuing protests rock Hong Kong: In pictures Protesters fall back as they clash with police during a protest at Kowloon Bay in Hong Kong on August 24 AFP/Getty Continuing protests rock Hong Kong: In pictures Police clash with pro-democracy protesters at the Hong Kong international airport on August 13 Reuters Continuing protests rock Hong Kong: In pictures Riot police move to disperse protesters during a clash at the Hong Kong international airport on August 13 Reuters Continuing protests rock Hong Kong: In pictures Commuters riding in a bus drive past protesters in Hong Kong's Kowloon Bay on August 24 AFP/Getty Continuing protests rock Hong Kong: In pictures Protester hold umbrellas as they take part in a pro-democracy march in Hong Kong on August 24 EPA Continuing protests rock Hong Kong: In pictures Riot police detain a demonstrator as they clash during a protest in Hong Kong on August 24 Reuters Continuing protests rock Hong Kong: In pictures Pro-democracy protesters block the entrance to the airport terminals after clashes with police at the Hong Kong international airport on August 13 AFP/Getty Continuing protests rock Hong Kong: In pictures Riot police spray pepper spray as shield themselves by a police van during a clash with pro-democracy protesters at the Hong Kong international airport on August 13 Reuters Continuing protests rock Hong Kong: In pictures Riot police use pepper spray to disperse protesters during a demonstration at the Hong Kong international airport on August 13 Reuters Continuing protests rock Hong Kong: In pictures Demonstrators shrouded in tear gas shield themselves behind barricades during a clash with riot police in Hong Kong on August 25 Reuters Continuing protests rock Hong Kong: In pictures Medical professionals gather to protest police brutality at the Queen Elizabeth Hospital in Hong Kong on August 13 Getty Images Continuing protests rock Hong Kong: In pictures Police detain a pro-democracy protester at the Hong Kong international airport on August 13 AFP/Getty Continuing protests rock Hong Kong: In pictures A protester is halted by police during an occupation at the Hong Kong international airport on August 13 AP Continuing protests rock Hong Kong: In pictures Police clash with pro-democracy protesters at the Hong Kong international airport on August 13 AFP/Getty Continuing protests rock Hong Kong: In pictures Police stand guard at the entrance of the departure terminals at the Hong Kong international airport on August 13 AFP/Getty Continuing protests rock Hong Kong: In pictures Protesters continue their occupation at the Hong Kong international airport on August 14 AP Continuing protests rock Hong Kong: In pictures Travellers read placards and posters left by pro-democracy protesters at the Hong Kong international airport on August 14 AP

Mr You did not mention any specific politician, but numerous members of US congress members including house speaker Nancy Pelosi have affirmed their country's commitment to human rights and urged the Hong Kong government to end the standoff.

Congress could pass legislation to back human rights in the region. That could mean the re-introduction of the Hong Kong Human Rights and Democracy Act, which would require the secretary of state to issue an annual certification of Hong Kong's autonomy to justify special treatment afforded to the city.

Donald Trump could also issue an executive order suspending Hong Kong’s special trading status with the US, which would have a devastating impact on the local economy at a time when Beijing and Washington are engaged in a bitter trade war.

Sunday’s rally followed another day of peaceful gatherings. On Saturday protesters and police did not clash during protests for the first time in weeks. Some bystanders did heckle officers but police appeared not to make any arrests.

Thousands of school teachers also took to the streets on Saturday, when they marched to the official residence of Hong Kong’s chief-executive Carrie Lam to show support for the protesters, many of whom are students.

Carrying signs that read “protect the next generation”, teachers tied white ribbons to a metal fence near Government House. They urged the government to answer protesters’ demands and stop using what they called police violence to disperse demonstrators.

The protest movement started over an extradition bill that would have allowed Hong Kong residents to stand for trial in mainland China, but demonstrators' demands have expanded to include Ms Lam’s resignation, democratic elections, and an independent investigation into police use of force.

Groups including local watchdog the Civil Rights Observer and the office of the UN High Commissioner for Human Rights have accused police of using excessive force. Officers have routinely fired tear gas and non-lethal weapons at protesters during clashes.

Members of China’s paramilitary People’s Armed Police force have been training for days across the border in Shenzhen, including on Sunday morning, causing speculation that they could be sent in to suppress the protests.