This picture whows a tornado sweeping through Tsukuba city in Ibaraki prefecture, north eastern Tokyo on May 6, 2012 A massive tornado has swept through eastern Japan, killing a teenager and injuring dozens of others. The twister ripped roofs of buildings, smashed windows and toppled heavy billboards. ­The 14-year-old died of injuries received when the roof of a house collapsed. The raging vortex...