Not one suspect imprisoned in Haiti has faced trial after being accused in the killing of President Jovenel Moïse, who was gunned down at his home in Port-au-Prince nearly four years ago.

Four key suspects in the killing of Haiti’s president appear for the first time in U.S. federal court to face accusations that they plotted and participated in his assassination, a day after they were transferred to the United States for prosecution.

U.S. officials say four key suspects in the killing of Haitian President Jovenel Moïse have been transferred to the United States for prosecution as the case stagnates in Haiti amid death threats that have spooked local judges.

Haiti’s interim government has asked the U.S. to deploy troops to protect key infrastructure as it tries to stabilize the country and prepare the way for elections in the aftermath of the assassination of President Jovenel Moïse.

Haitian officials said two men believed to be Haitian Americans — one of them purportedly a former bodyguard at the Canadian Embassy in Port au Prince — have been arrested in connection with the assassination of Haiti’s president.