The most powerful Caribbean hurricane in nearly a decade has hit Haiti, bringing 145mph (230km/h) winds, heavy rain and dangerous storm surges.
Hurricane Matthew, a Category Four storm, swept over the west of Haiti and is now heading towards eastern Cuba.
The US National Hurricane Center (NHC) said Haiti was “getting everything a major hurricane can throw at them”.
The deputy mayor of the southern coastal town of Les Cayes described the scene there as “catastrophic”.
Marie Claudette Regis Delerme said the city of 70,000 people was flooded and many houses had lost roofs. She herself had to flee a meeting when a gust ripped off the building’s roof.
One man too ill to leave his home was killed when waves struck in the town of Port Salut.
Haiti’s Interim President Jocelerme Privert said earlier that some people at sea or who had not “respected alerts” had died, but he gave no more details.
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Haiti is one of the world’s poorest countries and many of its 11 million residents live in areas prone to flooding and in flimsy housing. Matthew was expected to bring up to 40in (102cm) of rain to some parts as it moves north at about 15km/h.
Images from Les Cayes showed people walking in water shoulder high, with relief workers saying that other coastal communities were also under water, including Les Anglais.
Fonie Pierre, director of Catholic Relief Services for Les Cayes, told AP: “Many people are now asking for help, but it’s too late because there is no way to go evacuate them.”
The mayor of Les Cayes, Jean Gabriel Fortune, posted tweets that included video showing damage in the Vernet area.
Little protection: Nick Bryant, BBC News, Fond Parisien, Haiti
Haiti has been taking a brutal pounding. The conditions here are atrocious – to step outside is to be drenched within seconds.
Most vulnerable have been those who inhabit the shacks along the western coastline. There, storm surges are the main danger.
People here are confronting life-threatening flooding and the likelihood of mudslides in a landscape denuded of trees.
This Category Four storm comes as this impoverished country is still recovering from the 2010 earthquake which killed more than 200,000 people, and a cholera epidemic that followed.
Many live in shanty towns that offer little protection from the high winds and rains. And many refused to evacuate, fearing that what few possessions they have left would be stolen.
The mayor of Tiburon, Remiza Denize, spoke of large waves hitting the town: “Everyone is trying to find a safe place to protect themselves.”
Marie Alta Jean-Baptiste, director of the country’s Civil Protection Agency, said that there had been a major landslide between Les Cayes and Tiburon.
A farmer in the town of Leogane, Milriste Nelson, said: “All the banana trees, all the mangoes, everything is gone.”
Guantanamo Bay evacuation
Haitian officials say that about 1,300 emergency shelters have been built, enough to accommodate 340,000 people. Both airports in Haiti are closed.
One local in Port-au-Prince said the community would unite in the face of the storm’s danger.
“We are communicating amongst ourselves thanks to our own means. We will tell the people how the situation is. If things are bad then we will come together.”
Unicef said more than four million children might be exposed to hurricane damage.
The UN children’s fund representative in Haiti, Marc Vincent, said: “Waterborne diseases are the first threat to children in similar situations – our first priority is to make sure children have enough safe water.”
An NHC statement said: “On the forecast track, the eye of Matthew will move near eastern Cuba later [on Tuesday], and move near or over portions of the south-eastern and central Bahamas [on Tuesday night] and Wednesday, and approach the north-western Bahamas on Wednesday night.”
About 13,000 people were evacuated from high-risk areas in the Dominican Republic and a hurricane alert is in place for six eastern Cuban provinces, with residents moved from low-lying areas.
President Raul Castro addressed people in Santiago de Cuba, saying: “We will immediately face the situation to restore and overcome the damage it causes us.”
Some 700 spouses and children of US service members have been flown out of the Guantanamo Bay base, which is just 80km from where the storm could make landfall.
It is also predicted to hit the US east coast later in the week. Florida and parts of North Carolina have declared states of emergency.
Hurricane Matthew is the region’s most powerful since Felix in 2007.
Category one: sustained winds of 74-95mph (119-153 km/h); some damage and power cuts
Category two: winds of 96-110mph (154-177 km/h); extensive damage
Category three: winds of 111-129mph (178-208 km/h); well-built homes suffer major damage
Category four: winds of 130-156mph (209-251 km/h); severe damage to well-built homes, most trees snapped or uprooted
Category five: winds of 157 mph (252 km/h) or higher; high percentage of homes destroyed, area uninhabitable for weeks or months