At least 19 people have died in Jamaica as a result of Hurricane Melissa, Information Minister Dana Morris Dixon has said, as search and rescue efforts continue and authorities try to get aid to hard-hit areas.

The hurricane, one of the most powerful to strike the Caribbean, has also killed at least 30 people in Haiti, officials said.

In Jamaica, "there are entire communities that seem to be marooned and areas that seem to be flattened," Dixon said, adding there are "devastating" scenes in western regions.

Electricity remains out to most of the island and as people try to salvage damaged homes and belongings from floodwaters and mud, many thousands are growing increasingly desperate for aid.

There are parts of the country that have been without water for several days and food is growing increasingly scarce.

Aid supplies are starting to arrive more rapidly with the main airport in the Jamaican capital, Kingston, largely back to normal.

But smaller regional airports, some of which are located near to where humanitarian assistance is most needed, remain only partly operational.

As such, aid agencies and the military are bringing in the urgently needed supplies from Kingston via road, many of which remain unpassable in places.

Satellite imagery shows nearly all buildings in some Jamaican villages have been destroyed by the hurricane.

Residents of towns in western Jamaica told the BBC on Thursday that "words can't explain how devastating" the storm has been on the country.

"No one is able to get through to their loved ones," Trevor 'Zyanigh' Whyte told the BBC from the town of White House in Westmoreland parish.

"Everyone is just, you know, completely disconnected... Every tree is on the road, right, so you can't get too far with the cars, not even a bicycle," he said.

In Haiti, many of the victims in the storm died when a river overflowed in Petit-Goave. A full assessment is ongoing, as there are still areas that authorities have not been able to access.

Around 15,000 people were staying in more than 120 shelters in Haiti, interim UN co-ordinator for the country Gregoire Goodstein said.

In Cuba, more than 3 million people were "exposed to life-threatening conditions" during the hurricane, with 735,000 people "safely evacuated", according to the UN's resident co-ordinator for Cuba Francisco Pichon.

No fatalities have been reported so far in Cuba, but almost 240 communities have been cut off due to flooding and landslides, Cuban authorities said.

Hurricane Melissa made landfall on Tuesday in Jamaica as a category five storm, packing winds of up to 185 mph (295 km/h), before impacting other countries in the Caribbean.

Governments, humanitarian organisations and individuals around the world are pledging support for the nations hardest hit by the storm.

The World Food Programme said it is collaborating with partners to coordinate logistics, cash and emergency supplies across Jamaica, Cuba, Haiti and the Dominican Republic.

The US State Department said it is deploying a disaster response team to the region to help with search and rescue operations, and assisting in efforts to provide food, water, medical supplies, hygiene kits and temporary shelters.

The UK government on Friday said it is mobilising an additional £5m ($6m) to send humanitarian supplies, including shelter kits and solar powered lanterns, to help people without power and whose homes have been damaged.

That is on top of £2.5m ($3.36m) already announced in emergency humanitarian funding to support recovery in the Caribbean.

The Foreign Office is also preparing flights to evacuate British nationals unable to come home on commercial flights.

While Jamaica, Cuba and Haiti assessed the damage left in Melissa's wake, Bermuda braced for impact.

The Bermuda Weather Service expected Melissa to be a category two hurricane when it passed the British overseas territory on Thursday night.

Government offices in Bermuda will close until Friday afternoon and all schools will shut on Friday.

"Until the official 'All Clear' is issued, residents are urged to stay off the roads so Government work crews can safely assess and clear debris," a public alert from the government said.

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