The nation's terror alert level remains at orange -- the second-highest warning for a possible attack.
Homeland Security Secretary Tom Ridge said the risk continues to be assessed -- not only day-to-day but hour-by-hour.
He refused to comment on reports that the informant who led to the latest alert change has failed a lie-detector test.
Ridge said the decision to raise alert levels is based on "multiple sources." But he added if the government should ever determine the information leading to a change is inaccurate, the alert level would be lowered.
He continues to urge Americans to prepare for any emergency by building up supplies -- including duct tape and plastic sheeting. But Ridge is stressing Americans shouldn't begin using that material yet to seal up windows and doors.
Next week, Ridge said his department will release a document that is aimed at informing and educating Americans about alert dangers -- without alarming them.
wtvynews4.com Extended Web Coverage
Homeland Security Advisory System Recommendations for Families
Severe – Red
High – Orange
Elevated – Yellow
Guarded – Blue
Low – Green
(The American Red Cross Web Site) contributed to this report
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