At least 14 people were killed on Monday when a blast hit Pakistan's southern city of Hyderabad, a hospital official said, but police said it was not immediately clear what caused the explosion. "According to initial reports, the blast occurred in a truck which was parked in a truck stand," Hyderabad police chief Fayyaz Leghari told Reuters. "We cannot say at the moment whether it was a bomb, or something else caused the blast," he said. Nawaz Abbasi, medical superintendent at the Liaquat University Hospital, said his hospital had received 14 bodies, and at least 30 people wounded. Hyderabad is located 160 km (100 miles) north of the southern financial capital of Karachi.