Critics warn the law will shut down dissent

China has passed a controversial security law giving it new powers over Hong Kong, deepening fears for the city’s freedoms, the BBC has learned.

It is set to criminalise secession, subversion and collusion with foreign forces, but will also effectively curtail protests and freedom of speech.

The move follows increasing unrest and a widening pro-democracy movement.

Veteran activists have already said they will march on Wednesday, despite the risk of arrest under the new law.

But the Demosisto pro-democracy organisation, spearheaded by one of Hong Kong’s most prominent activists, Joshua Wong, announced on Facebook on Tuesday it was ceasing all operations. Mr Wong had earlier said he was leaving the group.

China has not yet officially confirmed the law has been passed and no draft was made public beforehand, meaning residents are still unclear of the measures they will have to abide by. The law could be implemented as early as Wednesday.

Hong Kong was handed back to China from British control in 1997, but under a special agreement that guaranteed certain rights for 50 years.

UK Foreign Secretary Dominic Raab expressed “deep concern” at the reports the law had been passed, saying: “This would be a grave step.”

Protests rocked Hong Kong last year, sparked by a bill intended to enable extraditions to the mainland

The law has sparked demonstrations in Hong Kong since it was announced by Beijing in May. China says it is needed to tackle unrest and instability and rejects criticism as interference in its affairs.

The new law

The BBC has been told that the law went through unanimously in a session of the Standing Committee of the National People’s Congress in Beijing.

It is expected to be added to Hong Kong statute books later in the day and comes a day before the 23rd anniversary of the handover from Britain to China – a date usually marked by pro-democracy protests.

It would make criminal any act of secession, subversion of the central government, terrorism and collusion with foreign or external forces.

A new office in Hong Kong would deal with national security cases, but would also have other powers such as overseeing education about national security in Hong Kong schools.

In addition, the city will have to establish its own national security commission to enforce the laws, with a Beijing-appointed adviser.

Hong Kong’s chief executive will have the power to appoint judges to hear national security cases, a move which has raised fears about judicial independence.

Importantly, Beijing will have power over how the law should be interpreted. If the law conflicts with any Hong Kong law, the Beijing law takes priority.

Possible change in Hong Kong

For many, the law undermines the freedoms that set Hong Kong apart from the rest of China and helped define its character.

People in Hong Kong prize civil liberties such as free speech, the right to protest and an entirely independent and robust judiciary, as permitted in its mini-constitution, the Basic Law, agreed when the territory’s sovereignty was returned to China in 1997.

In recent years, Hong Kong has seen waves of protests demanding more rights. Last year, rallies over a now-scrapped bill permitting extraditions to the mainland turned violent and fuelled a broad pro-democracy movement.

Chief Executive Carrie Lam says the new law is a “responsible” move to protect the law-abiding majority.

She has said that Hong Kong’s freedoms, vibrancy and core values will be preserved.