At least four persons including a women were killed and six others injured when a passenger bus they were traveling in turned turtle due to over-speeding in Pakistan s Sindh province Sunday, police said. The bus was heading towards Karachi from Shah Aqiq near Thattha. It went out of control of the driver due to over-speeding. According to police, the recklessly driven passenger bus met with an accident at Matka Stop near the under construction Thatta Sajawal Bridge. The dead bodies and those injured in the accident were shifted to the Thatta Civil hospital.