HONG KONG (REUTERS) - Cracks appeared to emerge on Friday (June 14) in the support base for a proposed Hong Kong law that would allow extraditions to China as opponents of the Bill vowed further demonstrations after hundreds of thousands took to the streets this week.

The extradition Bill, which will cover Hong Kong residents and foreign and Chinese nationals living or travelling in the city, has many concerned it may threaten the rule of law that underpins Hong Kong's international financial status.

Opposition to the Bill on Sunday triggered the former British colony's biggest political demonstration since its return to Chinese rule in 1997 under a "once country, two systems" deal guaranteeing it special autonomy, including freedom of assembly, free press and independent judiciary.

Many accuse China of extensive meddling since then, including obstruction of democratic reforms, interference with elections and of being behind the disappearance of five Hong Kong-based booksellers, starting in 2015, who specialised in works critical of Chinese leaders.

On Friday, one of the key advisers to Hong Kong leader Carrie Lam, Executive Council member Bernard Chan, told Cable TV that he did not think formal discussion of the Bill, a precursor to a final vote by the legislature, should continue at present given the opposition.

"Do we consult, strengthen the Bill, or what? Is there still any chance of the Bill passing? These are all factors the government must consider," he said.

"But I definitely say that right now it's not possible - at a time when there are such intense divisions - to keep discussing this issue. The difficulty is very high."

Mr Michael Tien, a member of Hong Kong's legislature and a deputy to China's national Parliament, urged the city government to put the Bill on hold.

And 22 former government officials or Legislative Council members, including former security secretary Peter Lai Hing-ling, signed a statement calling on Mrs Lam to "yield to public opinion and withdraw the Bill for more thorough deliberation".

"It is time for Hong Kong to have a cool-down period," Mr Lai told Reuters. "Let frayed tempers settle before we resume discussion of this controversial issue. Please, no more blood-letting!"

Beijing-backed Mrs Lam has stood by the Bill, saying it is necessary to plug loopholes that allow criminals wanted on the mainland to use the city as a haven. She has said Hong Kong courts would safeguard human rights.

Courts in mainland China are controlled by the Communist Party.

China has rejected accusations of undermining Hong Kong's freedoms. State media said this week that "foreign forces" were trying to damage China by creating chaos. The Foreign Ministry said on Friday that plots to bring chaos in Hong Kong would not succeed.

Mrs Lam has not appeared in public or commented since Wednesday.

China, where courts are controlled by the Communist Party, has rejected accusations of undermining Hong Kong's freedoms.

Chinese Foreign Ministry spokesman Geng Shuang said Hong Kong matters were an internal affair for China and nobody had a right to interfere.

"Any vain plots to cause chaos in Hong Kong or to damage Hong Kong's prosperity and stability will be resolutely opposed by the whole people of China including the vast majority of Hong Kong compatriots," he said. "This does not enjoy popular support and will not succeed."

The proposed Bill has thrown Hong Kong, one of the world's most densely populated cities, into chaos, starting on Sunday with a march against the extradition Bill that drew what organisers said was more than a million people.

Tens of thousands demonstrated in the following days. On Wednesday, protesters surrounded the legislature and swarmed on to a major highway, before being forced back by riot police firing volleys of tear gas and rubber bullets.

On Friday, police kept a close watch as the city returned to normalcy, with most protesters retreating and banks reopening.

But further demonstrations are planned.

Organisers have urged people to take to the streets on Sunday and protesters have applied for a permit to gather on Monday, when legislators may reconvene to discuss the Bill. The Confederation of Trade Unions and Professional Teachers Union called for a citywide strike.

A few dozen demonstrators clustered on Friday near the legislature, which had been scheduled to debate the Bill this week.

"We are going to be here from today to show people that we are here to support. Everyone is planning for a big march on Sunday like last week but no one knows what will happen at night or after," said a woman surnamed Chan, who was helping at a makeshift first-aid and supply station.

Police have made more than a dozen arrests, some in hospitals and university campuses, while over 81 people were wounded in the clashes.

In the United States, senior congressional lawmakers from both parties introduced legislation to require an annual justification from the US government for the continuation of special business and trade privileges to Hong Kong.

China called on the United States not to pass such legislation.

The hawkish Chinese newspaper, the Global Times, lambasted foreign leaders for being hypocrites and failing to condemn what it called violent demonstrators.

"This is a stark provocation," an editorial on its website said on Friday. "These US senators make us see the dark mind of the US political elite who just want to turn Hong Kong into a chaotic place by hyping the uncontrolled violent street politics."