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MORE ON THIS STORY RELATED STORIES • Christmas Eve Alert Was Fake, Sources Say • Worry Defiance in Response to Terror Warnings • Fears of Possible Terror Attack Build

The informant described a detailed plan that an al Qaeda cell operating in either Virginia or Detroit had developed a way to slip past airport scanners with dirty bombs encased in shoes, suitcases, or laptops, sources told ABCNEWS. The informant reportedly cited specific targets of government buildings and Christian or clerical centers.

"This piece of that puzzle turns out to be fabricated and therefore the reason for a lot of the alarm, particularly in Washington this week, has been dissipated after they found out that this information was not true," said Vince Cannistraro, former CIA counter-terrorism chief and ABCNEWS consultant.

It was only after the threat level was elevated to orange — meaning high — last week, that the informant was subjected to a polygraph test by the FBI, officials told ABCNEWS.

"This person did not pass," said Cannistraro.

According to officials, the FBI and the CIA are pointing fingers at each other. An FBI spokesperson told ABCNEWS today he was "not familiar with the scenario," but did not think it was accurate.

Despite the fabricated report, there are no plans to change the threat level. Officials said other intelligence has been validated and that the high level of precautions is fully warranted.

New Yorkers Taking Police Presence in Stride

In New York, police are out in force in the subways, at train stations and airports and at the bridge and tunnel crossings into the city with radiation detectors and gas masks. In a press conference this afternoon, Mayor Michael Bloomberg said 16,000 law enforcement officials trained to combat terrorism were deployed in the city. Air patrols have also returned to New York.

"We are constantly changing what we're doing so no one can predict what instruments we'll be using and where we'll be going," Bloomberg said. The mayor stressed that while people should be vigilant, they should also be aware that New York City has been on code level orange for 17 months — since the Sept. 11, 2001 attacks that destroyed the World Trade Center.

New Yorkers, and people around the country, should not be frozen by fear and must carry on with their daily lives, the mayor said. New York Gov. George Pataki said it is important for people to be alert to anything suspicious around them, but that they should not spread rumors that could create panic.

‘Threat Is Still There’

"By no means do people believe the threat has evaporated," said Cannistraro. "The threat is still there, the question really is the timing and when this is going to happen."

It's not the first time a captured al Qaeda operative has made up a huge story and scared a lot of people.

The FBI concluded the information that led to a nationwide hunt for five men suspected of infiltrating the United States on Christmas Eve was fabricated by an informant, and the agency called off the alert sparked by the information.

Officials said this one got so far because it coincided with other intelligence, that officials still believe points to a coming attack, timed to hostilities with Iraq.