Explosive residue was found on failed 17th St.levee debris.

Divers inspecting the ruptured levee walls surrounding New Orleans found something that piqued their interest -- burn marks on underwater debris chunks from the broken levee wall.

One diver, a member of the U.S. Army Corps of Engineers, saw the burn marks and knew immediately what caused them.

He secreted a small chunk of the cement inside his diving suit and later arranged for it to be sent to trusted military friends at a The U.S. Army Forensic Laboratory at Fort Gillem, Georgia for testing.

According to well placed sources, a military forensic specialist determined the burn marks on the cement chunks did, in fact, come from high explosives.

The source, speaking on condition of anonymity said "We found traces of boron-enhanced fluoronitramino explosives as well as PBXN-111. This would indicate at least two separate types of explosive devices."

The levee ruptures in New Orleans did not take place during Hurricane Katrina, but rather a day after the hurricane struck.