More than 1,000 military personnel are now in the region, with another 200 due to arrive within days, along with more than 60 police officers, she said.
Duncan's remarks came as Foreign Secretary Boris Johnson is in the Caribbean to visit communities hit by the devastating hurricane.
Ragnath's family members were not with him when disaster struck.
Branson, who has lived in the British Virgin Islands for the past 11 years, weathered Irma on Necker, his private island. They include Anguilla, St. Martin, Antigua and Barbuda, and St Kitts and Nevis.
In a series of tweets and postings on Instagram, Mr Branson showed the extensive damage to Necker, his own island in the British Virgin Islands (BVI).
Hurricane Irma has caused a real disaster in several Caribbean islands.
Despite sending troops and ships to deliver help, France, Britain and the Netherlands have been criticized for an insufficient response in islands that are their territories.
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He said he was there "to additionally activate help endeavors and remaking anticipates the British Virgin Islands and more extensive Caribbean".
"As you can see from the photos, much of the buildings and vegetation on Necker [Island] has been destroyed or badly damaged", he wrote in a blog post to the Virgin site Monday.
Johnson, who has dismissed the criticism from local residents and British tourists as "completely unjustified", will visit the affected British Overseas Territories, the foreign ministry said on Twitter.
The U.K. government defended its response to Hurricane Irma yesterday, amid claims it has been slow to help British overseas territories devastated by the storm.
It hit Florida over the weekend, bringing widespread flooding and leaving more than 2.1 million homes and businesses without power, and the category-three storm is now expected to tear up the state's west coast.
At least 37 people were killed in the Caribbean, with 12 dead in Florida, four killed in SC and two in Georgia. Cruise lines have also activated humanitarian missions to the Caribbean island.
"The UK government will have a massive role to play in the recovery of its territories affected by Irma - both through short-term aid and long-term infrastructure spending", he wrote. Some islanders said they had been told that they could expect to be without electricity for months. French President Emmanuel Macron planned to survey damage on the French-controlled portion of St. Martin; the other side of the island, St. Maarten, is controlled by the Netherlands.