CHATTANOOGA, Tenn. -- A Ku Klux Klansman helped build seven pipe bombs that a federal informant told him would be rigged to vehicles used by Haitians and Hispanics, a federal agent testified Friday at a detention hearing. Videotapes of meetings between the informant and Daniel Schertz, 27, showed them making the bombs and discussing how they would be used, Bureau of Alcohol, Tobacco, Firearms and Explosives agent Lorin Coppock testified.