Hurricane Matthew kills almost 900 in Haiti before hitting US

The number of deaths in Haiti, the poorest country in the Americas, surged to at least 877 on Friday as information trickled in from remote areas previously cut off by the storm, according to a Reuters tally of death tolls given by officials.

Matthew triggered mass evacuations along the US coast from Florida through Georgia and into South Carolina and North Carolina.

US President Barack Obama urged people not to be complacent and to heed safety instructions.

"The potential for storm surge, loss of life and severe property damage exists," Obama told reporters after a briefing with emergency management officials about the fiercest cyclone to affect the United States since Superstorm Sandy four years ago.

Matthew smashed through Haiti's western peninsula on Tuesday with 233 kph winds and torrential rain. Some 61,500 people were in shelters, officials said, after the storm pushed the sea into fragile coastal villages, some of which were only now being contacted.

At least three towns in the hills and coast of Haiti's fertile western tip reported dozens of people killed, including the farming village of Chantal where the mayor said 86 people died, mostly when trees crushed houses. He said 20 others were missing.

Matthew sideswiped Florida's coast with winds of up to 195 kph but did not make landfall in the state. The US National Hurricane Center (NHC) downgraded the storm to a Category 2 on the five-step Saffir-Simpson scale of hurricane intensity as its sustained winds dropped to 110 mph. Category 5 is the strongest.

There were at least four storm-related deaths in Florida but no immediate reports of significant damage in cities and towns where the storm swamped streets, toppled trees and knocked out power to more than 1 million people.

Two people were killed by falling trees, according to Florida officials, and an elderly couple died of carbon monoxide poisoning from a generator while sheltering from the storm inside a garage.

Hurricane warnings late yesterday extended up the Atlantic coast from northeast Florida through Georgia and South Carolina and into North Carolina.

In Daytona Beach, the street under the city's famed "World's Most Famous Beach" sign was clogged with debris washed up by the ocean. The waves had receded by early afternoon but there was damage throughout the city, including a facade ripped off the front of a seaside hotel.

Robert Walker, a 51-year-old mechanic, weathered the worst of the storm in his seaside Daytona Beach apartment where high-powered winds peeled back the roof.

"It sounded like a jet plane coming over. I was scared," said Walker as he stood in front of the battered remains of the two-story building.

At 11 p.m. EDT, Matthew's eye was about 185 km south-southeast of Charleston, South Carolina, and moving northward at 19 kph, the NHC said.

After passing near or over the coast of Georgia it was on a track that would put it near or over South Carolina on Saturday. Though gradually weakening, it was forecast to remain a hurricane until it begins moving away from the US Southeast on Sunday, the NHC said.

Craig Fugate, director of the Federal Emergency Management Agency, said he was concerned that relatively light damage so far could give people up the coast a false sense of security.

"People should not be looking at the damages they're seeing and saying this storm is not that bad," Fugate told NBC.

"The real danger still is storm surge, particularly in northern Florida and southern Georgia. These are very vulnerable areas. They've never seen this kind of damage potential since the late 1800s," Fugate said.

In St. Augustine just south of Jacksonville, Florida, about half of the 14,000 residents refused to heed evacuation orders despite warnings of an 2.4-meter storm surge that could sink entire neighborhoods, Mayor Nancy Shaver said in a telephone interview from the area's emergency operations center.