FBI Director Christopher Wray revealed on Friday that a single fingerprint left on a package to an address in Maryland, one of the 13 posted to prominent US figures, led to the apprehension of Cesar Sayoc, 56, a resident of Aventura, Florida. Wray spoke to reporters at a news conference called by the Department of Justice. While most of the packages contained “dangerous, unstable material” the FBI does not know if the bombs were functional, the FBI director said. It was too soon to discuss motive, he added. None of the crude pipe bombs in the yellow envelopes exploded. If convicted, Sayoc could face 58 years in jail on four federal charges. The investigation is still in its early stages and may involve additional suspects. The suspect’s van was towed to the FBI lab for examination.