FAA says, ""There has been no such report.", of snipers in NOLA: "'We're controlling every single aircraft in that airspace and none of them reported being fired on,' she said, adding that the FAA was in contact with the military as well as civilian aircraft.
from http://abcnews.go.com/US/wireStory?id=1087205 ]
It's probably good to keep in mind that the last two major disasters of this scale, the Galveston hurricane of 1900 (some 6,000 dead) and the late 1800s Johnstown, PA flood (2,200 fatalities), both involved false reports of 'minority' savagery, Blacks and Eastern Europeans supposedly rampaging and cutting off the fingers of the dead to get their rings. All or most of these stories, many reported in the respectable press of the time, are now believed to have been completely untrue or wildly exaggerated."