Clashes have erupted at the site occupied by protestors in the Hong Kong district of Mong Kok.
According to reports, police moved in after some protestors had breached their barriers, resulting in the clashes.
The protestors say the police charge was unprovoked.
Pro-democracy activists, many of them students and youths, have been out on the street in Hong Kong for over a month, calling for democratic reforms. They oppose the Chinese government's control over the candidates for the city's chief executive, demanding that the candidacy should be opened up to all.