At least three persons were killed and four others injured after a passenger bus struck a truck, parked on roadside here in Dera Ghazi Khan on early Monday. According to police, a Peshawar bound passenger bus coming from Karachi hit the goods laden truck parked along the road road in tehsil Kot Chattha of Dera Ghazi Khan near main bus terminal. As a result of accident three passengers were killed on the spot while four others sustained injuries. The police and rescue personnel shifted the bodies and injured to District Headquarters (DHQ) Hospital where according to hospital sources condition of the injured people was our of danger. The passengers said that the accident took place due to careless driving and over speeding by bus driver.