Terror threat in Washington with the 10th anniversary of the Sep 11 attacks

US intelligence officials say they have "very specific", credible but unconfirmed reports of a terror threat in Washington and New York coinciding with the 10th anniversary of the 9/11 attacks.
An ABC News report quoted intelligence officials as saying that at least three individuals, including an American citizen"entered the country in August by air with the intent to launch a vehicle-borne attack against Washington DC or for more details....