Katrina leaves 'toxic time-bomb'

New Orleans has been described as a toxic time-bomb.

While the initial crisis is over, the city's mayor has told police to use force with those who are refusing to evacuate the area.

The warning has come amid fears that survivors will not survive flood waters contaminated with decomposing bodies, raw sewage and chemicals.

Mayor of New Orleans Ray Nagin told residents to “get out” because of health risks.

“There are toxins in the water. There are gas leaks where we may have explosions. We're fighting at least five fires right now and we don't have running water. It is not safe,” he said.