Rescuers transfer a victim's body to a local hospital in southern Pakistani port city of Karachi, Dec. 29, 2012. At least six people were killed and over 50 others were injured when a bomb hit a passenger bus in Karachi on Saturday afternoon, local police said. (Xinhua/Arshad)

Two Pakistani women mourn over the death of their relatives at a local hospital in southern Pakistani port city of Karachi, Dec. 29, 2012. At least six people were killed and over 50 others were injured when a bomb hit a passenger bus in Karachi on Saturday afternoon, local police said. (Xinhua/Arshad)