Police in Pakistan said a head-on collision Tuesday morning between a passenger bus and a truck on a highway in the country's south has killed 58 people. A police official said the accident happened near Khairpur district in Sindh province, and that the cause most likely was heavy fog. The bus was carrying about 70 people and had left the Swat Valley en route to the southern port city of Karachi when it collided head-on with the truck, police said. A local hospital official said 14 women and eight children were among the fatalities. Deadly accidents happen often in Pakistan due to bad road infrastructure and disregard of traffic laws.