The explosion last month at a fertilizer plant in West, Texas, claimed the lives of fourteen people and resulted in some of the most goose-bump-inducing YouTube clips known to man. The cause remains unknown as investigators ruled out water, natural causes, anhydrous ammonium, and ammonium nitrate in a rail car as likely explanations, but today investigators took the search to the next level: A criminal probe has been launched alongside the news that Bryce Reed, a first-responder who was interviewed extensively by the media in the aftermath, was arrested for having possession of a “destructive device,” identified as a pipe bomb, that may or may not be related to the investigation. (Update: Reed has been charged for possession of pipe bomb components., but there is still no solid link between him and the fertilizer plant explosion.)