An explosion of a parcel may injure some persons.Logical formLearned from2 sentences. An origin of a parcel may be investigated.Logical formLearned from2 sentences. (Parcel bombs) may undergo sendings.Logical formLearned from2 sentences. Responsibility can be for some (parcel bomb attacks).Logical formLearned from2 sentences. A reference can be to parcels.Logical formLearned from2 sentences. Some (parcel bombs) may be sent to an airline.Logical formLearned from2 sentences. A parcel can be a bomb.Logical formLearned from2 sentences. A (police officer) may be injured by a (parcel bomb).Logical formLearned from2 sentences. A (parcel bomb) can be in a city.Logical formLearned from2 sentences. A (parcel bomb) may kill some (police officers).Logical formLearned from2 sentences. An ingredient may be used in (parcel bombs).Logical formLearned from2 sentences. Some (parcel bombs) can be in a city.Logical formLearned from2 sentences. A rash of (parcel bombs) can be an attempt.Logical formLearned from2 sentences. Some (parcel bombs) may be targeted.Logical formLearned from2 sentences. Involvement can be in a series of (parcel bomb blasts).Logical formLearned from2 sentences.