Number Found at Spain Site Leads to Arrest (Madrid Train bombing )
And included in the article we have:
_________________________________________________
On Thursday, the FBI arrested an American lawyer, Brandon Mayfield, 37, in the United States as a material witness in the case.
Spanish officials say at least one of Mayfield's fingerprints were found on a plastic bag containing detonators of the kind used in the attacks. The bag was found in a van left near the station from which three of the four trains bombed on March 11 departed. U.S. officials said a single print of Mayfield's was found on the bag.
The newspaper El Pais reported Saturday that Spanish investigators have serious doubts as to whether the print is Mayfield's. They have no record of him traveling to Spain recently, and experts found only eight points of similarity between the print and the one of Mayfield held in U.S. files because of his status as a former member of the Army. The FBI said it found 15 such points, El Pais said.
The Interior Ministry declined to comment on the report.