U.S. Report Lists Possibilities for Terrorist Attacks and Likely Toll / The New York Times, 16 Mar 2005

http://www.nytimes.com/2005/03/16/politics/16home.html?th&oref=login
Eric Lipton
"Department of Homeland Security, trying to focus antiterrorism spending better nationwide, has identified a dozen possible strikes it views as most plausible or devastating, including detonation of a nuclear device in a major city, release of sarin nerve agent in office buildings and a truck bombing of a sports arena. The document, known simply as the National Planning Scenarios, reads more like a doomsday plan, offering estimates of the probable deaths and economic damage caused by each type of attack."