ISLAMABAD: At least six people on Tuesday were killed while 15 others sustained severe injuries as a passenger bus overturned on Indus Highway in Jamshoro. The incident took place when a speeding van en route to Karachi from Shahdadkot turned turtle on Indus Highway, which ruslted in killing of six people while 15 others got injured, a private news channel reported. The injured were shifted to the hospital in Edhi ambulances where the doctors stated that four of the injured are in critical condition. Three children are also among the dead while police termed the mishap as a result of high speed.