China has imposed a sweeping national security law on Hong Kong, dramatically tightening its grip on the semi-autonomous city in a historic move decried by Western nations as a threat to the financial hub's freedoms.
The agency for semi-autonomous city will collect intelligence and handle crimes against national security, official Xinhua news agency reports.
Seven months of massive and often violent rallies kicked off on June 9 last year when as many as one million people took to the streets to oppose a bill allowing extraditions to mainland China.
US President Donald Trump is due to announce later his response to the China's security legislation that Beijing says aims to tackle secession, subversion, terrorism and foreign interference in the city.
Beijing unveiled plans last week for national security legislation for Hong Kong that aims to tackle secession, subversion and terrorist activities.
Chinese foreign minister Wang Yi insisted in Beijing that the proposed law must be imposed "without the slightest delay".
The most controversial move at the National People's Congress opening was the introduction of a proposal to impose a security law in Hong Kong –– immediately denounced by critics who called it a death sentence for the territory's unique freedoms.
Authorities banned an application for a Mother's Day march so small groups of masked protesters instead played cat and mouse with police in different shopping centres.
Police arrest about a dozen protesters and use pepper spray to break up a protest in Sheung Shui shopping mall aimed at disrupting retail businesses near border with mainland China.
The protests have been largely peaceful for much of December after pro-democracy candidates overwhelmingly won district council elections the month before.
Hundreds of Hong Kong elders have taken to the streets on Saturday to back students for a unity rally as anti-Beijing activists vowed to battle what they say is police brutality and unlawful arrests.
The Polytechnic University stand-off is one of the more dramatic episodes in six months of unrest that began in June with protests over an extradition bill seen by many in Hong Kong as an erosion of freedoms.
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