Some of the former Colombian servicemen arrested after last week’s assassination of Haiti’s president previously received U.S. military training, according to the Pentagon, raising fresh questions about the United States’ ties to Jovenel Moïse’s death.

“A review of our training databases indicates that a small number of the Colombian individuals detained as part of this investigation had participated in past U.S. military training and education programs, while serving as active members of the Colombian Military Forces,” Lt. Col. Ken Hoffman, a Pentagon spokesman, said in a statement to The Washington Post.

The Pentagon’s review is ongoing, Hoffman said. He did not say how many of the men received training or precisely what it entailed.

Sen. Patrick J. Leahy (D-Vt.), whose legislation provides oversight of foreign defense aid used in human rights abuses, said the episode was a grim reminder that U.S. assistance to other countries can take unexpected turns.

“This illustrates that while we want our training of foreign armies to build professionalism and respect for human rights, the training is only as good as the institution itself,” Leahy said.

“The Colombian army, which we have supported for 20 years, has a long history of targeting civilians, violating the laws of war and not being accountable. There has been a cultural problem within that institution.”

Haitian police on July 11 arrested Christian Emmanuel Sanon, who they suspect was a mastermind behind the assassination of President Jovenel Moïse on July 7. (Reuters)

Colombian officials initially said that 13 of 15 Colombian suspects in the July 7 assassination plot once served in that country’s military, including the two killed by Haitian authorities after Moïse was fatally shot inside his home.

It is common for Colombian troops and other security personnel across Latin America to receive U.S. training and education. Colombia, in particular, has been a significant U.S. military partner for decades, receiving billions of U.S. dollars since 2000 in its effort to battle drug trafficking organizations, leftist guerrillas and far-right paramilitary groups.

That effort has included CIA-backed missions and a close relationship between Colombian military personnel and the U.S. Green Berets, who help train their elite counterparts in guerrilla warfare. A Colombian commando school is modeled on the Army’s grueling Ranger School, and the two militaries’ partnership dates to at least the 1950s.

Colombian military and police also use U.S.-provided weapons and equipment, an agreement that came under scrutiny earlier this year after police there killed multiple protesters during demonstrations against government tax proposals. A related analysis by The Post, published in May, found that Colombian authorities overstepped their own rules of engagement in some of the deadly encounters.

Fighting in Colombia’s decades-long war has been a springboard for military veterans to trade their U.S.-funded experience for hire in other global conflicts, such as in Yemen.

“The recruitment of Colombian soldiers to go to other parts of the world as mercenaries is an issue that has existed for a long time, because there is no law that prohibits it,” the commander of Colombia’s armed forces, Gen. Luis Fernando Navarro, told reporters last week.

Foreign military training provided by the United States is intended to promote “respect for human rights, compliance with the rule of law, and militaries subordinate to democratically elected civilian leadership,” Hoffman, the Pentagon spokesman, said in his statement. He did not immediately respond to questions seeking additional information.

The disclosure that some of the assassination suspects received U.S. training, which has not been previously reported, is certain to complicate the already murky understanding of how the plot to kill Moïse took shape, and who was involved.

Two U.S. citizens of Haitian descent are among those who have been arrested, and Haitian authorities identified five companies associated with the case, including CTU Security, based in Florida. Colombian police also identified 19 plane tickets purchased by a company credit card registered in Miami. The tickets were used by some of the 21 Colombian suspects to travel from Bogotá, Colombia, to Santo Domingo, Dominican Republic, authorities said.

Christian Emmanuel Sanon, 63, an American doctor and pastor who frequently traveled between Haiti and Florida, was arrested in connection with the plot. Authorities have claimed he was positioning himself to run for president in the impoverished Caribbean nation and had a role in hiring the alleged assassins, but they have provided little evidence about his alleged involvement.

To date, Haitian authorities have arrested at least 20 people in connection with Moïse’s death, which has plunged the country into a leadership crisis. Late Wednesday, officials confirmed they had detained the presidential palace’s head of security.

Authorities in Haiti are investigating Moïse’s killing with assistance from the FBI, Department of Homeland Security and personnel from Colombia’s government. President Biden has condemned the assassination and appealed for calm, but on Thursday he appeared to turn down a request from Haiti’s government for military security assistance. Speaking at the White House, Biden said a contingent of Marines would be sent to reinforce the U.S. Embassy in Port-au-Prince. Deploying American troops elsewhere in Haiti, he said, is “not on the agenda.”

Samantha Schmidt, Widlore Merancourt, Rachel Pannett and Anthony Faiola contributed to this report.