Eighteen suspects in the 2021 assassination of Haitian President Jovenel Moise have been arrested and flown to the United States to stand trial, U.S. law enforcement officials announced Sunday.

The suspects are among 30 people who were indicted in connection with Moise's slaying, U.S. Attorney for the Southern District of Florida Jason Reding Quinones said in a social media post.

"The assassination of President Jovenel Moïse was a horrific attack, and we remain fully committed to working shoulder to shoulder with our partners to further expose the criminal network behind it, identify every individual who played a role, and ensure that the last person responsible is brought to justice," he said.

Moise was killed July 7, 2021, in a brazen attack on his home in the capital Port-au-Prince by armed assailants. His wife, Martine Moise, sustained gunshot wounds to her arms and thigh as well as suffered other injuries during the assault.

Authorities at the time said 20 Colombian citizens and a handful of dual Haitian-American citizens participated in a plot in which the original aim was to kidnap and arrest Moise but which backfired and devolved into an assassination.

"In July 2021, President Jovenel Moise was assassinated by individuals seeking to profit from illicit financial opportunities and business contracts," FBI Special Agent in Charge Brett Skiles said in a statement issued Sunday. "Today's multi-location and international arrests underscore the FBI's continued commitment to bringing all participants in this plot to justice."

A U.S. military aircraft was at Port-au-Prince's international airport earlier on Sunday to pick up former Colombian soldiers accused of taking part in the assassination, the Miami Herald reported.

The arrests come four months after four Florida men were convicted on charges stemming from the plot to kidnap or kill the Haitian leader.

Arcangel Pretel Ortiz, Antonio Intriago, Walter Veintemilla and James Solages were found guilty of scheming to violently overthrow Moïse and install their handpicked successor so that they could obtain lucrative government contracts in Haiti.

Prosecutors said that in order to carry out the plot, they recruited allies in the United States, Colombia, and Haiti, including 22 former Colombian Army soldiers and Haitian gang leaders.

The Herald reported it remained unclear if a key remaining suspect -- former Haitian government official Joseph Felix Badio -- is among those extradited to the United States.

Text messages presented as evidence at the Florida men's trial indicated Badio played an important role as the plot evolved from a kidnapping into an assassination. (UPI)