Port-Au-Prince: At least 27 people were killed in a major road accident in Haiti when a truck carrying people overturned on a highway south of Haiti's capital, hospital officials said.

"By now, we have counted 27 dead," Joel Charles, hospital director in the town of Petit-Goave said. "Seriously injured people have passed away, and we have other people in critical condition."

Earlier reports put the death toll at 20, while 40 others were reported injured. The accident occurred yesterday when a truck carrying small retail traders, many of them women, overturned on National Highway 2, near a community known as Morne Tapion.

In addition to passengers, the vehicle was overloaded with bags of food and other merchandise, a typical way to transport goods in Haiti.

A local judge who witnessed the accident said the truck was climbing a steep incline when it lost its balance and went tumbling down.

"This is a dangerous road where accidents occur frequently," said the witness who preferred to withhold his name.

Four people lost their lives and a dozen more were injured in an accident that occurred in the same area just last week.

Seventeen people were confirmed dead at the site of Saturday's accident, according to Charles. Ten more succumbed after ambulances of the Haitian Red Cross took them to the hospital.

Overall about 40 people have been hospitalised, many with serious injuries, in the wake of the accident, the doctor said.

"Some of the injuries are critical, a lot of head trauma and broken bones. We need surgeons, other medical specialists and ambulances" Charles said. "The victims need to be transported to hospitals in Port-au-Prince."