Police may brandish (riot shields).Logical formLearned from15 sentences. (Riot police) may erect barricades.Logical formLearned from15 sentences. Government can be in wake of riots.Logical formLearned from15 sentences. Riots can be in the past.Logical formLearned from15 sentences. A confrontation can be with (riot police).Logical formLearned from15 sentences. (Riot police) can be in force.Logical formLearned from15 sentences. A (bomb blast) may spark riots.Logical formLearned from15 sentences. Riots may begin after a (gang member shot).Logical formLearned from15 sentences. An unrest may threaten a repeat of riots.Logical formLearned from15 sentences. Destruction of a mosque may set_off riots.Logical formLearned from15 sentences. Riots can be in weeks.Logical formLearned from15 sentences. Riots can be with police.Logical formLearned from15 sentences. Riots can be after (noon prayers).Logical formLearned from15 sentences. A country may run riot.Logical formLearned from15 sentences. Riots may escalate.Logical formLearned from15 sentences.