Thousands of people protesting against China's decision to vet candidates in Hong Kong's 2017 elections have refused to budge from the government complex in Hong Kong for another day, despite appeals to leave, a report said.
Overnight, riot police advanced on crowds who ignored official warnings that the protests were illegal, the BBC reported.
Rejecting rumours that the Chinese army might intervene, Hong Kong's chief executive, CY Leung requested the demonstrators to keep calm.
In the wake of the demonstrations, more than 200 bus routes have been cancelled or diverted; and some subway exits in protest areas have been blocked. Several banks have suspended operations in affected areas.
Police said they arrested 78 people on Sunday following 70 arrests on Saturday.
They have so far used batons, tear gas and pepper spray against protesters.
The report quoted a spokesman for China's Hong Kong and Macau affairs office as saying that Beijing "firmly opposes all illegal activities that could undermine rule of law and jeopardise social tranquillity." The spokesperson added that Beijing has offered strong support to the Hong Kong government.