A tipster has sent us five photos of brand new works by semi-secret superfamous street artist Banksy. All five were just put up in New Orleans, to commemorate the third anniversary of Hurricane Katrina on August 29. Some of the pieces relate directly the hurricane and its disastrous aftermath; others are targeted at the legacy of Fred Radtke, an infamous N.O. anti-graffiti crusader known as the "Gray Ghost" for his practice of painting over graffiti in gray paint—regardless of the color of the underlying wall. They're all pretty great. Five [UPDATE: Now six!] pieces, after the jump:

[Original photos by John d'Addario , toaminorplace, and Anthonyturducken's Flickr.]