Communal riots can be in a world-city.Logical formLearned from9 sentences. Extremists may set_off riots.Logical formLearned from9 sentences. (Riot police) may be backed by soldiers.Logical formLearned from9 sentences. Scores may be injured in riots.Logical formLearned from9 sentences. (Riot police) may regain control of a situation.Logical formLearned from9 sentences. Truckfuls can be constituted-of-or-filled-with (riot police).Logical formLearned from9 sentences. Dozens of (riot police) may be deployed.Logical formLearned from9 sentences. A policeman can be during riots.Logical formLearned from9 sentences. Riots can be by residents.Logical formLearned from9 sentences. A riot can be at a (crossing point).Logical formLearned from9 sentences. Police can be untrained in (riot control).Logical formLearned from9 sentences. Riots can be over a (cholera outbreak).Logical formLearned from9 sentences. Riots may shake a capital.Logical formLearned from9 sentences. Hundreds of persons may be killed in riots.Logical formLearned from9 sentences. Riots may oust president.Logical formLearned from9 sentences.