Fifth Texas parcel bomb blast leaves U.S. investigators baffled

By Jon Herskovitz and Jim ForsythAUSTIN/SCHERTZ, Texas (Reuters) - A package bomb blew up at a FedEx distribution center near San Antonio on Tuesday, the fifth in a series of attacks that have rocked Texas this month and left baffled investigators searching for what they suspect is a serial bomber.The package filled with nails and metal shrapnel was mailed from Austin to another address in Austin and passed through a sorting center in Schertz, about 65 miles (105 km) away, when it exploded on a