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.
Hong Kong Chief Executive open for talks with protestors (16 October 2014)
Clashes as police clear Hong Kong protestors (14 October 2014)
Hundreds of pro-democracy protesters march through Hong Kong (14 September 2014)