well, the scale is apparently enough to halt ALL rescue and relief operations. no boat rescues, no buses leaving the superdome, etc.
9 people trapped in the Bell South Building but they have airconditioning and lights. They are scared that people will see this and head for them.
It's not "ALL," and it would only take one or two shooters to shut anything down. Again: you and I simply don't know enough about the real situation. Nor, might I add, do you or I know what's being done in response, other than what the MSM tells us (late and unreliable), or what our own scanner-watchers are saying (hard to interpret, as the calls are explicitly local: no big-picture info provided).