Head of the US Agency for International Development (USAID) has compared the damage from Hurricane Dorian in the Bahamas to that of a nuclear bomb.
Mark Green said he had taken a flight to observe the damage caused by the storm on Grand Bahama and the Abacos islands.
Dorian ripped through the Bahamas last Sunday with category five winds with some gusts reaching 300km/h (200mph).
So far 43 people are confirmed dead however the number is expected to rise.
Prime Minister Hubert Minnis called the loss of life “catastrophic and devastating”.
Mr Green told Reuters news agency: “I was struck by the focused nature of the devastation.
“There are parts of Abaco and the Bahamas that don’t show a great deal of damage, and then there are clusters and communities that were devastated, almost as though nuclear bombs were dropped on them.”
USAID says it is working with the government of the Bahamas to provide emergency shelter, medical care, food and water.
About 3,500 people have been evacuated to Nassau so far. On Saturday, a cruise liner carrying 1,400 people docked in Riviera Beach, Florida.
Officials have acknowledged that Nassau will struggle to house all of the people requiring shelter.
According to the United Nations’ World Food Programme, some 70,000 people are in need of food and shelter. The islands have a population of about 400,000.
In Marsh Harbour in the Abacos, 90% of infrastructure is damaged or destroyed.