well I don't know how you call complete anarchy, looting, robbery, rapes, murders and fights at every corner, police losing control of the situation...but well that looks a lot like a riot...
(and don't tell me that in a "real " riot, people are supposed to "ask" for something or to have any kind of political message... in most riots people are just looking for a good fight vs the police and a way to steal some stuff...)