At least four people were killed and multiple others injured when a passenger bus collided with a tractor trolley in Tiyaro area of Lasbela district on Saturday afternoon. According to Police officials, tragic road accident claimed four lives on the spot when a passenger coach en route to Karachi from Kharan collided with a tractor trolley in Tiyaro area, private news channel reported. Rescue teams rushed the injured to nearby hospitals, while the authorities have launched an investigation into the cause of the accident.