Sudden anti-government protests erupted across Hong Kong on Sunday, marking the 19th straight weekend of unrest amid a political crisis that has been dragging on for more than four months. Protesters vandalised targeted shops and threw objects onto railway tracks at one station, continuing their violent campaign against the MTR Corporation. They also heeded online calls to take their cause to shopping centres in different districts, targeting businesses with mainland Chinese ties. Police moved in swiftly to restore order. Our blog below captured events as they unfolded. Reporting by Simone McCarthy, Elizabeth Cheung, Fiona Sun and Jeffie Lam.