pProtesters set cars on fire with flares during the second day of the G20 Summit in Hamburg, Germany, on July 7. At the start of the summit a day earlier, police used water cannon in an effort to disperse demonstrators.ppHeavy security was present from the outset, as police on Thursday warned protestersa their planned rally would not go ahead unless people removed face masks.ppThis video was taken along the Elbchaussee in Hamburg. Cars were ablaze and citizens in the streets were trying to extinguish the fires.