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Isaac heads towards New Orleans

29 August 2012 Last updated at 10:43 BST

Thousands of people have fled the US city of New Orleans as Hurricane Isaac makes its approach

The city has closed its new floodgates in a bid to protect it from the effects of high waters brought by sustained winds of up to 80mph (130km/h).

President Obama warned residents in the hurricane's path not to "tempt fate" and to heed evacuation warnings.

Alistair Leithead has been on the streets in New Orleans.