The storm has dumped record rainfall, leaving large parts of the Texas city underwater, homes destroyed and more than 20 people reported dead.

Houston mayor Sylvester Turner said the curfew was needed to head off looting.

Harvey, now downgraded to a tropical storm, has made landfall again in Louisiana after hovering offshore in the Gulf of Mexico.

Low-lying New Orleans, which was devastated by Hurricane Katrina in 2005, is readying to receive up to 10in (25cm) of rain in 36 hours, with flash flooding a major risk.

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BBC News