At least four people were killed and ten others wounded in a head-on collision between a passenger bus and a truck in Pakistan s Balochistan province on Monday, police said. The bus was heading to Karachi from Balochistan capital of Quetta. It collided with the truck coming from the opposition direction near Pir Umar (Khuzdar). The truck driver was among those killed in the accident. The injured persons were rushed Civil Hospital Khuzdar.