Portland, Ore., lawyer Brandon Mayfield, 37, shown in this undated image from video, was arrested by FBI agents Thursday, May 6, 2004 as part of the investigation into the deadly train bombings in Spain, federal officials said. Mayfield, a U.S. citizen, was taken into custody on a material witness warrant. The arrest is the first known in the United States with connections to the March 11 bombings in Madrid. (AP Photo/KGW-TV)