A protest may end with (riot police).Logical formLearned from18 sentences. Riots can be in towns.Logical formLearned from18 sentences. A (tourist tunnel) may spark riots.Logical formLearned from18 sentences. (Riot police) may block marches.Logical formLearned from18 sentences. Some busloads can be constituted-of-or-filled-with (riot police).Logical formLearned from18 sentences. Clashes may break_out between (riot police).Logical formLearned from18 sentences. Riots may rock a world-city.Logical formLearned from18 sentences. (Riot police) may break_up protests.Logical formLearned from18 sentences. Riots may shake a country.Logical formLearned from18 sentences. Some (riot police) may stand guard.Logical formLearned from18 sentences. Riots may begin on a month.Logical formLearned from18 sentences. (Security forces) may break_up a riot.Logical formLearned from18 sentences. Riots can be by a majority.Logical formLearned from18 sentences. Riots may be triggered.Logical formLearned from18 sentences. Communal riots can be widespread.Logical formLearned from18 sentences.