By way of The News Blog, a first person account of life in New Orleans immediately after the hurricane. The most horrifying thing is the story of the Gretna sheriff's department:

As we approached the bridge, armed Gretna sheriffs formed a line across the foot of the bridge. Before we were close enough to speak, they began firing their weapons over our heads. This sent the crowd fleeing in various directions. As the crowd scattered and dissipated, a few of us inched forward and managed to engage some of the sheriffs in conversation. We told them of our conversation with the police commander and of the commander's assurances. The sheriffs informed us there were no buses waiting. The commander had lied to us to get us to move.

We questioned why we couldn't cross the bridge anyway, especially as there was little traffic on the 6-lane highway. They responded that the West Bank was not going to become New Orleans and there would be no Superdomes in their City. These were code words for if you are poor and black, you are not crossing the Mississippi River and you were not getting out of New Orleans.

And then it gets yet worse:

Unfortunately, our sinking feeling (along with the sinking City) was correct. Just as dusk set in, a Gretna Sheriff showed up, jumped out of his patrol vehicle, aimed his gun at our faces, screaming, "Get off the fucking freeway". A helicopter arrived and used the wind from its blades to blow away our flimsy structures. As we retreated, the sheriff loaded up his truck with our food and water.