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Isaac heads towards New Orleans
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.
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