A taxi exploded on a street in central China, killing its driver and passenger, the official Xinhua News Agency reported Friday. The cause of the explosion in the city of Leiyang in Hunan province was under investigation, the report said. Similar blasts elsewhere have been linked to mechanical problems or exploding gas tanks, although bombs have sometimes been used aboard public transportation in extortion or revenge attacks. Two pedestrians were wounded by flying debris, Xinhua said. Full Story