329 prisoners escaped from Croix-des-Bouquets prison located on the outskirts of the capital of Haiti, Port-au-Prince, media reports said.
About 15 gunmen in two Sport Utility Vehicles (SUV) showed up at the prison before noon on Sunday and opened fire on guards, wounding two, AP reported.
Haitian officials said the attack appeared to be timed to coincide with recreation time and prisoners began to riot as the shooting started.
The attack was apparently intended to free Clifford Brandt, a member of a wealthy family, who has been awaiting trial since 2012 for allegedly running a kidnapping ring in the capital.
The authorities are investigating whether there was cooperation from members of the Haitian police who guard the prison, Justice Minister Jean Renel Sanon said.
The government offered a reward equivalent to about $25000 for information leading to Brandt’s capture.