from Article:

Explosions?

There were reports of many explosions heard in New Orleans, officials say they were transformers blowing up. Total Information Analysis has reported a claim by intelligence expert Tom Heneghen that 25 earwitnesses cited explosions immediately before the levee breach.

Similar reports are now appearing in many web blogs:

"He also mentioned that right before the mass flood there was a loud sound like an explosion." - News from St. Bernard

"I'll tell you the worst thing I've heard and I heard it from my mother. She said she heard several blasts - big booms - right before the levees broke. Several blasts and then all the water came pouring in." - aangirfan

Although these are obviously not authoritative sources of information, it is interesting to note how many local people are reporting this. So interesting in fact that the mainstream has picked up on it in places.