One person was killed and 39 others injured when a passenger bus turned turtle due to over speeding here late Monday night. According to police a Sadiqabad bound passenger bus coming from Karachi overturned in Daraza Sharif locality of Khairpur. As a result of accident, 40 passengers including women and children sustained injuries. The local people and rescue personnel shifted the injured to Gambat and Ranipur Hospitals where one person succumbed to his wounds. Injured passengers said that over speeding and reckless driving was reason behind the accident.