Chariot racing in the Byzantine Empire also included the racing clubs. The Blues and the Greens were more than simply sports teams. They gained influence in military, political, and theological matters. The Blue-Green rivalry often erupted into gang warfare, and street violence had been on the rise in the reign of Justin I. Riots culminated in the Nika riots of 532 AD during the reign of Justinian I, with nearly half the city being burned or destroyed and tens of thousands of people killed.