[MEG33]

DC..Think about it and google Posse Comitatus

http://www.homelandsecurity.org/journal/articles/Trebilcock.htm
This talks about its erosion and interprets it in regards to a terror attack..

DC was excluded from the act

[TigersEye]

The Posse Comitatus Act has traditionally been viewed as a major barrier to the use of U.S. military forces in planning for homeland defense.[1] In fact, many in uniform believe that the act precludes the use of U.S. military assets in domestic security operations in any but the most extraordinary situations. As is often the case, reality bears little resemblance to the myth for homeland defense planners. Through a gradual erosion of the act’s prohibitions over the past 20 years, posse comitatus today is more of a procedural formality than an actual impediment to the use of U.S. military forces in homeland defense.

Thanks for the link. This seems like an extraordinary situation to me but maybe that's just me.

[TigersEye]

More info:

The military services were used for civilian law enforcement in 1992 when President Bush issued an Executive Order for the US Marines, Army, and the federalized California National Guard to restore order following the verdict of the Rodney King trial.

So much for the "President doesn't have the authority" rap.

Additional non-combat domestic duties were added. In 1992, the US Army and Air Force assumed a domestic disaster relief mission when they responded to assist after Hurricane Andrew in south Florida and after Hurricane Iniki in Hawaii a month later.

A precedent for hurricanes.