Attorneys for the FBI have told a federal judge in Utah that the agency has found no evidence that unreleased Oklahoma City bombing videos exist.

The comments came during the first day of a trial triggered by a Freedom of Information Act lawsuit by Salt Lake City lawyer Jesse Trentadue.

He says the FBI won't release videos that show a second person was with Timothy McVeigh when he parked a truck outside the Oklahoma City federal building and detonated a bomb that killed 168 people.

The government says McVeigh was alone.

U.S. District Judge Clark Waddoups sent the case to trial after remaining unsatisfied with the FBI's responses in the five years since the lawsuit was filed.

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FBI attorneys intend to call bureau employees to testify that the agency did a thorough search and how additional efforts would be burdensome and fruitless.

The trial is scheduled to last three days.