Haiti has asked Washington and the UN for troops to secure its ports, airport and other strategic sites after the assassination of president Jovenel Moise opened a power vacuum in the crisis-hit Caribbean nation, an official said Friday.

Several Colombians who were part of a heavily armed commando unit that assassinated Haitian President Jovenel Moise this week entered Haiti from neighboring Dominican Republic, sources in the Colombian army and national police said on Friday

Haitian authorities on Sunday arrested nearly two dozen people, including a Supreme Court judge, for their role in an alleged plot to oust President Jovenel Moise that has exacerbated political tensions in the troubled Caribbean country.

Sporadic gunfire echoed through the streets of Port-au-Prince on Monday as the government remained silent in the face of protests that have paralyzed the Haitian capital and triggered rising violence.

Embattled Haiti Prime Minister Jack Guy Lafontant resigned on Saturday following deadly violence and looting sparked by a now-abandoned plan to raise fuel prices, triggering a fraught process to form a new government.

Haiti's president on Saturday heralded the re-establishment of the country's military after 22 years, a divisive issue in the impoverished Caribbean nation which has a history of bloody coups and political instability.