(Police reinforcements) may be backed by (riot officers).Logical formLearned from11 sentences. (Riot police) can be elite.Logical formLearned from11 sentences. Riots can be in the north.Logical formLearned from11 sentences. (Riot officers) can be on horseback.Logical formLearned from11 sentences. Images can be constituted-of-or-filled-with riots.Logical formLearned from11 sentences. Fighting can be between (riot police).Logical formLearned from11 sentences. (Riot police) may beat protestors.Logical formLearned from11 sentences. Riots may erupt in a city.Logical formLearned from11 sentences. Riots can be in parts of the developing world.Logical formLearned from11 sentences. Riots can be by youth.Logical formLearned from11 sentences. Riots can be on an anniversary of an uprising.Logical formLearned from11 sentences. Riots can be heavy.Logical formLearned from11 sentences. A move may trigger riots.Logical formLearned from11 sentences. Defiance can be after (race riots).Logical formLearned from11 sentences. (Opposition supporters) may clash with (riot police).Logical formLearned from11 sentences.