Hong Kong is a divided city and some are preparing for a fight.

Secretly, groups of protesters have devised a plan to prevent the government from introducing a controversial law allowing for deliveries to countries including mainland China.

On Sunday, hundreds of thousands took part in peaceful protests, but a small number turned to violence.

Among them were students, Peter and Ivan (not their real names), who agreed to talk to Sky News anonymously.

They are now planning their next move before a second reading of the bill on Wednesday.

"Our protest will only be more violent and violent until the government reacts to the demands of the Hong Kong people," Ivan said.

"We do not want to hurt anyone, but if the police act violently against us, we can not wait for them to beat us, we need to fight back to defend ourselves."

Tensions are on the streets of Hong Kong

The young mother Kitty Hung brought her three-year-old daughter to the demonstration on Sunday.

She is against the violence, but also against the new law, which she believes jeopardizes her daughter's future.

She told Sky News, "I want her to grow up in a place where she can live without fear, I have a family in China and they can not talk publicly about government or political issues, I do not want that for my girl . "

Hundreds of protesters clashed with the police in front of the Hong Kong Parliament building
Hundreds of protesters clashed with the police in front of the Hong Kong Parliament building

While the extradition law was the trigger for demonstrators like Kitty, their fight is about something much bigger.

Many see this week as the last chance to protect the fundamental freedoms they enjoy in Hong Kong – freedoms they would not get in mainland China.

Despite this opposition, the government does not give in and says the debate will continue on Wednesday.

Ronny Tong, a member of the Executive Council of Hong Kong, is convinced that there is nothing to worry about.

He says that precautions are taken to defend human rights.

He said, "This bill deals with crimes abroad, not with crimes committed by people in Hong Kong, but with crimes committed by people abroad." "If you do not send your children abroad to commit crimes, why should you be worried? "

Protesters march during a rally against a controversial extradition bill in Hong Kong
On Wednesday, a second reading of the bill will take place as the protests continue

Despite government assurances, the suspicion of Beijing is great.

In one street, I see magazines clapping about China's president, but the shopkeeper hushes them up quickly.

In recent years, a number of Hong Kong booksellers have disappeared or been imprisoned by the Chinese.

Among them is Lam Wing Kee, who was arrested by mainland security officials in 2015 after criticizing the leadership of the Communist Party.

He has now fled Hong Kong for Taiwan, fearing he might be extradited to China when the law enters into force.

"If the bill is passed, it's a death sentence for Hong Kong," he warned. "Hong Kong will lose its free status – the personal safety of every citizen will be questioned."

Thousands of extra police were called in before the debate on Wednesday.

At the train station, they seek people as they come through the barriers.

Hong Kong is now a city on the edge.