The San Antonio Texas Fire Department said a package bomb apparently bound for Austin exploded at a FedEx distribution center in Schertz, Texas, hurting one person, a FedEx employee who apparently suffered a non-life-threatening “percussion-type” injury from the blast. An FBI agent told CBS News “it’s more than possible” the package is related to explosions that have occurred in Austin in recent days.

The package exploded shortly after midnight on Tuesday.

ATF and FBI agents were at the scene of the FedEx facility Tuesday morning analyzing components of the explosive device. They were looking for any similarities of ingredients or components that are “a signature” that would link this package explosion to the other four bombing incidents in Austin, reports CBS News senior investigative producer Pat Milton.

A law enforcement source told Milton it appears the package that exploded was mailed from Austin to Austin, Texas.

The Austin Police Department said it is aware of the explosion and is working closely on the investigation with federal law enforcement agencies

Tuesday’s blast came as authorities searched for answers in a series of explosions that have rattled Austin. The most recent bombing in the city injured two men Sunday night in the quiet neighborhood of Travis Country in the southeast of the city. Police and federal agents said that blast — triggered along a street by a nearly invisible tripwire — suggests a “higher level of sophistication” than they have seen before in three early package bombs left on doorsteps, and means the carnage is now random, rather than targeted at someone in particular.

Explosion at FedEx facility near San Antonio likely linked to serial bomber, feds say