Traffic lights lies on road in New Orleans
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Tropical Storm Isaac batters New Orleans seven years after Katrina

30 August 2012 Last updated at 07:35 BST

Tropical storm Isaac has been lashing New Orleans and other southern US states.

The storm, which was downgraded from a hurricane, is still causing havoc as it moves slowly across the region.

Levees in low-lying New Orleans have stood firm, but sea water has breached barriers in a town south of the city.

Alistair Leithead reports.