The injured are receiving treatment provided by the IOM, and 11 of them have been transferred to the nearest hospital, the agency said.
Tens of thousands of people leave Haiti each year to escape poverty, lawlessness and gang violence within the country.
Earlier this year, rival armed groups took control of the capital, Port-au-Prince, forcing Prime Minister Ariel Henry to resign weeks later.
“This devastating incident highlights the dangers faced by children, women and men migrating via irregular routes, and shows the urgent need for safe and legal pathways for migration,” said Gregoire Goodstein, IOM Representative in Haiti.
“Haiti's socio-economic situation is dire. The extreme violence of the past few months has forced Haitians to take ever more desperate measures.”
According to the IOM, lack of economic opportunity, collapsed health systems and school closures are forcing many people to consider migration as their only option for survival.
According to UN data, gang violence killed or injured an average of more than one person every hour in the first three months of this year.
According to the IOM, more than 86,000 migrants have been forcibly returned to Haiti by neighboring countries this year, despite increased violence.
The Caribbean nation of Venezuela has been hit by a surge of violence since President Jovenel Moíz was assassinated three years ago.
This month, hundreds of Kenyan police officers arrived in Haiti as part of a mission to help Haitian police fight gangs.
