In the commercial district of Mong Kok, on the Kowloon peninsula, opponents of the demonstrators had tried to dismantle tents.
Police linked arms to try to separate the opposing groups.
Later, more pro-democracy activists flooded the area and now vastly outnumber their opponents, says the BBC's Martin Patience in Mong Kok.
They began chanting: "Go back to the mainland." Many activists suspect that these people are coordinated by the Hong Kong or Chinese governments. BBC
