The Federal Bureau of Investigation has incorrectly kept nearly 24,000 people on a terrorist watch list on the basis of outdated or sometimes irrelevant information, while missing people with genuine ties to terrorism who should have been on the list, according to a Justice Department report released Wednesday. Documents: Justice Department Report on F.B.I. Terror Watch List The report said the mistakes posed a risk to national security, because of the failure to flag actual terrorism suspects, and an unnecessary nuisance for nonsuspects who may be questioned at traffic stops or kept from boarding airplanes.

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