New Orleans Police Chief Edwin Compass said Friday that hurricane rescue efforts were hampered when relief workers came under attack by the city's criminal element, prompting conditions that resembled "urban warfare." "We have never had an urban warfare battle like this on any front in the history of our nation," Compass told NBC's "Dateline." "You're fighting in buildings that are pitch black with darkness. These individuals have root - the criminal element have looted all the gun shops and gun stores in this city, so they're armed, they're dangerous." Federal Emergency Management Agency Chief Michael Brown, under fire for his...