An investigation may remain open.Logical formLearned from163 sentences. An investigation can be large-scale.Logical formLearned from162 sentences. An investigation may suggest that something-is-the-case.Logical formLearned from162 sentences. An investigation can be into allegations.Logical formLearned from162 sentences. An investigation can be into irregularities.Logical formLearned from161 sentences. Targets may pertain-to an investigation.Logical formLearned from161 sentences. (Anthrax attacks) may undergo an investigation.Logical formLearned from159 sentences. Persons may launch an investigation.Logical formLearned from159 sentences. An investigation may pertain-to a justice-department.Logical formLearned from159 sentences. An investigation can be remedial.Logical formLearned from158 sentences. Investigations can be open.Logical formLearned from158 sentences. An investigation can be into accusations.Logical formLearned from157 sentences. A source can be close to an investigation.Logical formLearned from157 sentences. Police may begin an investigation.Logical formLearned from157 sentences. An investigation can be global.Logical formLearned from156 sentences.