HONG KONG: Hundreds of uniformed school students, many wearing masks, formed human chains in districts across Hong Kong on Monday in support of anti-government protesters after another weekend of clashes in the Chinese-ruled city.

Metro stations which had closed on Sunday amid sometimes violent confrontations reopened, although the mood in the Asian financial hub remained tense.

Activists join secondary schools students as they form a human chain demonstrating against what they say is police brutality against protesters, after clashes at Wan Chai district in Hong Kong, China on September 9, 2019. Photo: Reuters

Early on Monday, before school started, rows of students and alumni joined hands chanting "Hong Kong people, add oil", a which has become a cry of encouragement for the protest movement.

"The school-based human chain is the strongest showcase of how this protest is deep rooted in society, so deep rooted that it enters through the school students," said Alan Leong, an alumni of Wah Yan College in the city's Kowloon district.

Three months of protests over a now withdrawn extradition bill have evolved into a broader backlash against the government and greater calls for democracy.

Activists had started fires in the street and vandalised a metro station in the main business district of Central on Sunday after thousands rallied peacefully at the U.S. consulate, calling for help in bringing democracy to the special administrative region.

The students, brandished posters with the protesters' five demands for the government, they called on authorities to respond to the promises of freedom, human rights and rule of law.

University students were also expected to join the human chain protests during the day on their campuses.

One of the five demands - to formally withdraw the extradition bill - was announced last week by the city government leader, Carrie Lam, but protesters are angry about her failure to call an independent inquiry into accusations of police brutality during demonstrations.

The protesters' other demands include the retraction of the word "riot" to describe demonstrations, the release of all those arrested and the right for Hong Kong people to choose their own leaders.

'CORE VALUES'

Following the demonstration at the U.S. consulate on Sunday, Hong Kong's government warned foreign lawmakers not to interfere in the internal affairs of the former British colony after thousands of protesters called on U.S. President Donald Trump to "liberate" the city.

Hong Kong returned to China in 1997 under a "one country, two systems" formula that guarantees freedoms not enjoyed on the mainland. Many Hong Kong residents fear Beijing is eroding that autonomy.

China denies the accusation of meddling in the city's affairs and says Hong Kong is an internal affair. It has denounced the protests, accusing the United States and Britain of fomenting unrest, and warned of the damage to the economy.

Chinese state media on Monday said Hong Kong was an inseparable part of China and any form of secessionism "will be crushed".

The China Daily newspaper said Sunday's rally was proof foreign forces were behind the protests and warned demonstrators should "stop trying the patience of the central government".

A senior U.S. official, speaking on condition of anonymity, said the United States was monitoring events in Hong Kong.

"The freedoms of expression and assembly are core values that we share with the people of Hong Kong, and those freedoms must be vigorously protected. As the president has said, ‘They’re looking for democracy and I think most people want democracy’,” the official said.