And you thought conspiracy theorists were all members of the tin-foil hat set.
The Federal Bureau of Investigation ordered an internal review on Friday of its files to determine whether documents that might have been related to the 1995 Oklahoma City bombing were improperly withheld from investigators or defense lawyers in the case, a government official said.
The move came in response to an Associated Press article this week that raised fresh questions about whether Timothy J. McVeigh, who was executed in 2001 for the bombing, may have had more than one accomplice.
The article said documents never introduced at Mr. McVeigh's trial showed that F.B.I. agents had destroyed evidence and had failed to share other information that raised the possibility that a gang of white supremacist bank robbers may have helped Mr. McVeigh.
The evidence indicated that the robbers, a group called the Aryan Republican Army, possessed explosive blasting caps similar to those Mr. McVeigh stole and a driver's license with the name of an Arkansas gun dealer who may have been robbed as part of the Oklahoma City plot.
While the Oklahoma City bombing has been a source of widespread conspiracy theories, law enforcement officials say they have seen no solid evidence that anyone other than Mr. McVeigh and Terry L. Nichols, who will stand trial on state charges in Oklahoma next week, was involved in an attack, which killed more than 160 people.
