Police launched an investigation Sunday after an unknown gas was detected inside an international parcel from Taiwan delivered to a home in the central city of Cheonan, officials said. The Cheonan Seobuk Police Station received a report that an unidentified parcel, wrapped around an A4-sized plastic bag, was delivered to a home in Cheonan, 85 kilometers south of Seoul, at 12:41 p.m. Saturday. The package was found to...