Federal officials are investigating after a package bound for Austin, Texas, exploded at a FedEx distribution facility near San Antonio early Tuesday, officials said.

The package was said to contain shrapnel and nails, according to the San Antonio Fire Department.

One person was hurt in the explosion, sustaining a "percussive type injury" that was not life threatening. 

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CBS News, citing an FBI official, said "it's more than possible" that the explosion at the distribution center in Schertz, Texas, is related to other recent explosions in the Austin area.

The Tuesday explosion marked the fourth this month. So far, two people have been killed in the blasts, and several others have been injured.

A blast on Sunday night left two men injured after they apparently triggered a tripwire that set off an explosive device attached to a for-sale sign in a residential area.

Authorities have not yet identified any one person or organization believed to be behind the explosions.