Isaac strengthens into hurricane

Storm continues trek toward Gulf states

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ORLANDO, Fla. - Isaac has strengthened into a Category 1 hurricane with 75 mph winds as it makes its way toward Louisiana.

The U.S. National Hurricane Center said Tuesday that Isaac gained strength as it moved over the warm, open waters of the Gulf of Mexico.

Isaac is expected to make landfall over southeastern Louisiana, possibly the New Orleans area, either late Tuesday or early Wednesday.

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