Reed, who was arrested early Friday, is charged with possession of a destructive device.

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Also on Friday, paramedic Bryce Reed made a brief court appearance in the town of Waco where he was charged with owning an unregistered destructive device.

BBC: Texas fertiliser plant blast: Criminal probe launched

"At this time authorities will not speculate whether the possession of the unregistered destructive device has any connection to the West fertilizer plant explosion, " the U.S. attorney's office for the Western District of Texas said in a release.

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Authorities announced the criminal investigation last Friday, the same day investigators said a paramedic who responded to the fire was arrested on suspicion of possession of a destructive device after investigators allegedly found materials to make a pipe bomb at his home.

CNN: Cause of catastrophic Texas explosions remains mystery