Thousands more people have been joining pro-democracy protesters in Hong Kong, ahead of what organisers hope will be thelargest day of protests so far.
Tens of thousands of people have been blocking parts of the city for days.
They are demanding that China withdraw plans to vet candidates for the next leadership election in 2017.
Current leader CY Leung has urged the protesters to go home, and Chinese President Xi Jinping has reaffirmed Beijing's influence on the territory.
Mr Xi told party leaders in Beijing that his government would "unswervingly implement the guidelines of 'one country, two systems' and the Basic Law, and steadfastly safeguard the long-term prosperity and stability of Hong Kong and Macau".
The streets were relatively quiet on Tuesday but thousands flocked the protest camps as night fell.
The demonstrators - who include students, supporters of the Occupy Central group and others angered by the police response - said they were confident that they would step up the protests for Wednesday's National Day holiday, which marks the anniversary of the founding of Communist China.
"I think there will be a massive turnout, over 100,000 people tonight and leading into National Day," Occupy Central activist Ed Chin told AFP news agency.
"We are not afraid of riot police.... We will not leave until Leung Chun-ying resigns,'' student leader Lester Shum told the crowd.
The protests began at the weekend, and police responded with tear gas and pepper spray. Police later withdrew and protesters have remained calm.