One person was injured early Tuesday morning after a package exploded at the FedEx ground facility in Schertz outside of San Antonio. Investigators say roughly 75 employees were working at the facility when the blast occurred. The FBI suspects this could be related to the four explosions in Austin. The ATF is also involved in this investigation now. Officials say the scene has been secured. The person injured was not seriously hurt and treated at the scene. Stay with 3News as we continue to follow this developing story.