A federal judge has ordered the FBI to scrutinize allegations that the agency pressured a witness not to testify in a trial about videos related to the Oklahoma City bombing. U.S. District Judge Clark Waddoups said the agency needs to get to the bottom of the claims from Utah lawyer Jesse Trentadue, who said that the FBI threatened to cut off a former government operative's benefits if he appeared in court. Waddoups decided the lawyer's report raises disturbing questions, and he wanted evidence that the agency has thoroughly investigated the matter. Waddoups ordered the attorneys to present the results of the witness-tampering investigation on Nov. 13. The hearing is the latest in a case that reignited questions about whether others were involved in the bombing that killed 168 people. Trentadue argues surveillance videos from 1995 show Timothy McVeigh had an accomplice. The agency says its investigators have done a reasonable search and found no evidence of additional unreleased videos. [John] Matthews was supposed to testify during a late July bench trial, but Trentadue argued that he backed out at the last minute because the FBI threatened to cut off his veteran's and disability benefits. Trentadue said Matthews was part of a stealth government operation before the Oklahoma City bombing tracking militia movements of which McVeigh was a part, and his testimony could support the idea that there was a second suspect. Matthews told him and a colleague that he had been pressured in phone calls just before and after he was supposed to testify, the lawyer said.