FBI and DHS will assist investigation of Haitian president's assassination, White House says

The U.S. is sending senior FBI and DHS officials to Port-au-Prince as soon as possible to assist with the investigation into the brutal assassination of Haitian President Jovenel Moise, the White House said Friday, in response to the Haitian government's formal request for assistance.

"The United States remains engaged and in close consultations with our Haitian and international partners to support the Haitian people in the aftermath of the assassination of the president," White House press secretary Jen Psaki said at a press briefing.

The U.S. State Department confirmed on Friday that two Americans have been arrested by Haitian authorities following the president's assassination.

"We are aware of the arrest of two U.S. citizens in Haiti and are monitoring the situation closely," a State Department spokesperson told CNBC. "We remain committed to cooperating with Haitian authorities on the investigation."

The State Department declined to comment any further, citing privacy considerations, and pointed to Haitian authorities for further information.

Mathias Pierre, Haiti's minister of elections, identified the American suspects, who are of Haitian descent, to several news outlets on Thursday as James Solages, 35, and Joseph Vincent, 55. They are among 15 suspects that Haitian police have detained so far in the shocking assassination, alongside 13 Colombians.

The search continues for at least nine people, and four others were killed by police in an exchange of gunfire, according to Haitian police. Haiti Chief of Police Leon Charles on Thursday urged the Haitian public to help authorities locate the other suspects but not to "take justice into their own hands."

U.S. President Joe Biden on Wednesday condemned the assassination and said he was "shocked and saddened to hear" about it.

"The United States offers condolences to the people of Haiti, and we stand ready to assist as we continue to work for a safe and secure Haiti," Biden said in a statement. 

A group of gunmen assassinated Moise and wounded his wife in their private residence Wednesday, plunging the Caribbean nation into an even deeper political crisis that has been fueled by gang violence and protests of the late president's increasingly authoritarian rule. 

Claude Joseph, Haiti's interim prime minister, said the police and military were now in control of security in Haiti. Authorities declared a siege in the country following the killing and closed the international airport. 

Haiti's ambassador to the U.S., Bocchit Edmond, has called for an international investigation into the assassination and has asked the U.S. for assistance in bolstering Haitian security. 

The State Department on Thursday vehemently denied that the Drug Enforcement Administration was involved in the assassination after the attackers reportedly identified themselves as DEA agents. 

Edmond has said the attackers were posing as DEA agents, describing them as "well-trained professional killers, commandos" based on a video shot from a neighbor's house during the attack. He also noted that some spoke Spanish. Haitians speak French and Creole. 

Protests against the late Haitian president turned violent in recent months as opposition leaders and their supporters demanded his resignation.

Moise had been accused of seeking to increase his power even after his term expired in February. Opposition leaders pointed to his approval of decrees limiting powers of a court that audits the government, and his creation of an intelligence agency that answers only to him.

Opposition leaders and their supporters also rejected Moise's plans to hold a constitutional referendum with controversial proposals that would strengthen the presidency's power.

-- The Associated Press contributed to this report