It sounds like the French Quarter is basically lawless right now, one armed personel carrier is not going to cover an entire metro city.
A huge caravan of busses has reached the Superdome. It's purpose is to evacuate the Superdome. Obviously, a road has been opened leading into the city. Busses and emergency services vehicles -- and some news satellite trucks -- are pouring in.
Saw this on Fox a short while ago. They have been late getting serious about covering this disaster, but as of a few minutes ago, their coverage was the best of any other TV news outlet. One of their satellite trucks has made it in and is broadcasting from right outside the Superdome.