Thousands of people in Hong Kong have surrounded police headquarters, calling for an extradition bill to be scrapped.
Police have asked the protesters to withdraw peacefully, saying their presence would “seriously affect” emergency services.
Millions of people have marched against the bill in recent weeks, with violent clashes breaking out with police.
The bill, which allows extradition to mainland China, has already been suspended.
Critics say it would erode the judicial independence of Hong Kong.
Hong Kong has been part of China since 1997 under the “one country, two systems” principle, which allows it freedoms not seen in mainland China.
The protest comes a day after the government ignored a deadline set by a group of students from various universities in Hong Kong, who called for the bill to be completely scrapped.
Early on Friday people gathered outside the Legislative Council Complex, or government headquarters, but then moved to surround police headquarters.
Among the protesters was student activist Joshua Wong, who became the face of pro-democracy protests in 2014. He was freed earlier this week after being jailed in May on contempt charges related to the 2014 demonstrations.
In a tweet on Friday, Mr Wong called for police to drop charges against people arrested in the recent protests.
Later in the day, some protesters also moved to Hong Kong’s Revenue Tower.
The Labour Department said several services based in the building would be suspended for the afternoon.
The mass protests are against amendments to the extradition law that would allow suspects accused of criminal wrongdoing to be extradited to mainland China.
This is significant because though Hong Kong is part of China, it keeps its own judicial independence, legislature and economic system.
People fear that if the extradition bill passes, it would erode this judicial independence and bring Hong Kong more decisively under China’s control.
Critics of the bill, including lawyers and rights groups, also say it leaves people in Hong Kong exposed to China’s justice system, which is marred by allegations of torture, forced confessions and arbitrary detentions.
China has backed Ms Lam and the extradition bill throughout the unrest.
