"An official from the Department of Homeland Security told CNN that the agency has received intelligence regarding "a specific but not credible" threat to New York's subway system "in recent days."
The official said that the intelligence community concluded the information is of "doubtful credibility.""
This from the department that can't find it's way to New Orleans, can't find an illegal immigrant, and likey can not find sand in a desert.
Sorry, I go with the NYPD and Mayor Bloomberg.
http://www.cnn.com/2005/US/10/07/newyork.subways/index.html