The head of the US federal emergency agency has said Hurricane Irma will "devastate" either Florida or neighbouring states.
Brock Long said parts of Florida would be without power for days. Half a million people in the state have been ordered to leave their homes.
Hurricane Irma has left a trail of destruction in the Caribbean, affecting an estimated 1.2m people.
At least 20 people are known to have died so far.
It has been downgraded to a category four storm, but officials warn that it remains "extremely dangerous".
The US National Weather Service says that Irma was expected to bring wind speeds of around 270km/h over this weekend as it hits Florida.
Long says that Hurricane Irma continues to be a threat that is going to devastate the United States in either Florida or some of the south‑eastern states.
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