Reported by several news sources, this one is from a North Carolina NBC Affiliate:
http://www.wcnc.com/news/topstories/stories/091205-ad-wcnc-farrakhan.4fb21767.html
"I heard from a very reliable source who saw a 25 foot deep crater under the levee breach. It may have been blown up to destroy the black part of town and keep the white part dry," Farrakhan said.