Austin, Texas: One employee was injured when a package containing nails and shrapnel that was bound for Austin, Texas, exploded at a Texas FedEx facility, the local fire department said.

The package exploded shortly after midnight local time at a distribution facility in Schertz, Texas, outside of San Antonio, about 65 miles south of Austin, the San Antonio Fire Department said in a Tweet.

It was unclear if the explosion was related to a string of bombings in the Texas capital over the past two weeks that have killed two people and wounded four.

The first three devices in Austin were parcel bombs dropped off at night in front of homes on the city’s east side, with the fourth a tripwire device that went off in a west side neighbourhood on Sunday. All four devices were similar, police said on Monday.