A fourth straight day of protests is under way in Hong Kong. Crowds have been marching in an outlying suburb ahead of a much larger rally in the centre of the city later. On Saturday, police fired tear gas to clear thousands of demonstrators. Activists are angry over a proposed extradition law and the police response to the protests. Al Jazeera's Andrew Thomas reports live from Hong Kong Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter / ajenglish Find us on Facebook / aljazeera Check our website: http://www.aljazeera.com/ #Aljazeeraenglish #HongKong #Hongkongprotests