For weeks now, pro-democracy protest groups have occupied parts of central Hong Kong, calling for open elections and the resignation of Hong Kong's Chief Executive Leung Chun-ying. Local police have been urging the demonstrators to leave for days, and have recently stepped up efforts to dismantle barricades on several major roads - only to have many of them rebuilt hours later. Tensions boiled over last night, leading to a violent clash between police and protesters. Police arrested dozens, and at least one demonstrator, politician Ken Tsang Kin-chiu, was dragged away and beaten by police, a moment caught in this video. As of today, most of the Occupy protesters remain in place, Beijing refuses to budge, and no discussions are underway.