Gunmen tried to assassinate Haitian Prime Minister Ariel Henry without success during a ceremony to mark the Caribbean independence on Saturday, his office said in a statement.
Henry's office said Monday that "bandits and terrorists" tried to shoot the prime minister in a church in the northern city of Gonaïves, where celebrations mark 218 years of war 'freedom.
Video footage posted on social media showed Henry and his aides rushing to their cars as an armed mob began firing outside Gonaïves Cathedral.
Haitian media have highlighted the possibility of a gang involvement in the shooting, which they say killed one person and injured two others.
Gangs in Haiti have been strengthened since the assassination of President Jovenel Moise in July.
Police, who described Saturday's attack as the work of "armed groups", could not immediately confirm the number of victims. Prior to the incident, a local gang leader had issued threats against Henry in local media.
The prime minister's office said arrest warrants had been issued for the suspects who shot Henry's convoy.
Henry, whose administration is facing increasing challenges to his legitimacy, was sworn in as prime minister just two weeks after Moise was assassinated by suspected mercenaries.
The country has not yet set a date for the election of Moses' successor.