Terrorists Not Threatening Indy 500

Have no fear, race fans -- well, at least not an inordinate amount of fear. The Indianapolis 500 may present an attractive target to terrorists, but there's no specific, credible threat to this year's race, the FBI and the Homeland Security Department say. Nevertheless, law enforcement and DHS officials, at the behest of Congress, are studying up on how to deal with potential threats to mass gatherings.