The 9/2 video here is of evacuee Charmaine Neville describing her experiences getting out of the 9th ward. A transcript is here.
I find some of the things she says a bit questionable, but she was obviously distraught when being taped. She says that helicopters would fly over but wouldn't ever stop, and then offers this:
A lot of those young men lost their minds because the helicopters would fly over us and they wouldn't stop. We'd do SOS on the flashlights, we'd do everything. And it came to a point. It really did come to a point where these young men were really so frustrated that they did start shooting. They weren't trying to hit the helicopters. Maybe they weren't seeing. Maybe if they heard this gunfire they will stop then. But that didn't help us. Nothing like that helped us.