Tropical Storm Isaac batters New Orleans seven years after Katrina

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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.

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