Four passengers were died and 24 were injured when a passenger bus fell into a deep ditch at National Highway near Zhob, reported 24NewsHD TV channel on Saturday.
According to rescue sources, the condition of several passengers is said to be critical.
The passenger coach was going to Quetta via Zhob from Islamabad.
Rescue 1122 personnel shifted the injured to trauma center Zhob.
Reporter: Essa Tareen