A package that exploded at a FedEx distribution center near San Antonio early Tuesday is being linked to four blasts in Austin this month, according to sources. Tuesday’s explosion occurred around 12:25 a.m. local time (1:25 a.m. ET) in the sorting area of a facility in Schertz, Texas, officials said. At a news conference Tuesday morning, authorities declined to make a connection between the FedEx explosion and the Austin incidents, but a source briefed on the investigation later said that the blasts are indeed linked. Schertz is located 50 miles away from Austin; the bomber is thought to have mailed two packages from a FedEx drop-off center on Brodie Lane in Austin. One of the packages made it to Schertz where it exploded before it was to be sorted and returned to Austin, while the other arrived at a FedEx facility near the Austin airport, according to the source. Both packages are believed to have contained nails, the source said. They were both thought to be bound for Austin.