Giving an update to MPs, Sir Alan said five people had died in the British Virgin Islands and four in Anguilla.
The NASA Earth Observatory released the images, taken by the Landsat 8 satellite, showing a side-by-side comparison of the Virgin Islands before and after Hurricane Irma struck, according to Business Insider.
However Mr Johnson said that the hurricane has been "an unprecedented event, an unprecedented catastrophe" for the people who live in the part of the Caribbean which has been worst hit.
The Daily Telegraph reported British Cabinet notes leaked to the press said 40 prisoners were on the loose.
Foreign Secretary Boris Johnson has travelled to the region to see the impact of the most powerful storm ever recorded in the Atlantic Ocean, and said the extra money was needed "massively". The U.K. government received criticism for its response to Hurricane Irma, with some U.K. citizens on islands saying they felt abandoned.
The Caribbean's Regional Response Mechanism (RRM) had been quickly activated, accompanied by aid and support from the UK, US, Canadian, French and Dutch governments.
"I think the scale of this hurricane is something quite unprecedented, but let me assure you, we are working hard now to bring relief to our own particular territories", Defense Secretary Michael Fallon said to Sky News.
In addition to the military personnel, 47 British police officers have also arrived in the British Virgin Islands to assist local officers.
"Just going round this hospital, 60% of it damaged, but the Royal Marines, our troops have been here since Friday and. another contingent of Royal Engineers arriving with their tools, with their spades and axes getting on with rebuilding the roofs and all the other structures".
"This will help get water, food, shelter and power to those left devastated by Hurricane Irma", she added. Knight claimed he was armed with a knife to combat potential looters.
Facts and figures on the United Kingdom government's relief work in the Caribbean and the British Overseas Territories in response to Hurricane Irma.