A heavily armed commando unit that assassinated Haiti’s president, Jovenel Moïse, was composed of 26 Colombians and two Haitian Americans, authorities have said, as the hunt goes on for the masterminds of the killing.

Moïse, 53, was fatally shot early on Wednesday at his home by what officials said was a group of foreign, trained killers, pitching the poorest country in the Americas deeper into turmoil amid political divisions, hunger and widespread gang violence.