"Credible" 9/11 anniversary terror threat

A terror threat that Homeland Security Department officials are calling "credible" but unconfirmed involving either New York or Washington bridges, or tunnels in the case of New York, is being investigated. It involves Sunday's anniversary of the 9/11 terror attacks. Local officials in the capital and New York are beefing up their security.

The possible attacks are believed to involve car or truck bombs.

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